Definition of gerontic in English:

gerontic

adjective dʒɛˈrɒntɪkjəˈrän(t)ik

Relating to old age, elderly people, or senescent animals or plants.
（人，动植物）老年的，衰老的
Example sentencesExamples
- The gerontic whorl of gastropod genera of the subfamily Mitchelliinae is twisted both outwards and backwards, but not upwards as in members of the subfamily Scoliostomatinae.
- These differences are not taken to be sufficient to merit recognition of a new species as they may be the result of ecophenotypic variations or gerontic developments in A. gigas.
- Rapid growth of the inner and basal parts of the apertural margin during their late shell ontogeny caused twisting of the gerontic whorl both outwards and backwards.
- In summary, examples of deviation from regular tight coiling during late shell stages and the development of a free gerontic whorl may be found in all known Cambrian-Devonian gastropod subclasses.
- A gerontic specimen, more than 8 mm wide, shows the development of high, elevated, bladelike accessory septa.
- A permesothyrid foramen is commonly associated with globular, gerontic forms within a single species population.
- Scattered undulose presepiments, disrupting as many as ten major septa, present in some adult and all gerontic specimens.
- The increasingly low relief of the anterior border with a narrow curvature of the anterior border furrow close to the anterior branches of the facial suture is certainly a gerontic feature.
- Specimens of Titanoplina were originally thought to be gerontic representatives of Proplina sibeliusi.
- None of the morphotypes are identical to the forms of A. concentricus and A. tamurai, especially because the latter species has a posterior radial groove and irregular ribs in gerontic individuals.
- However, this physical process cannot result in the simplification of septal folding in gerontic conchs.
- The gerontic aperture is narrowly elongated in species of Eoscoliostoma, but rather circular in Scoliostoma species.
- A few large specimens were known in 1986, however, these were thought to represent gerontic individuals.
- The feature has been considered to be a gerontic characteristic and of no systematic importance.
- This interpretation is also indirectly supported by the close stratigraphic occurrence (Early and Middle Devonian) of these gastropod genera having such an unusual gerontic aperture.
- The new species has also established that the strong revolving internal rib of Endoptygma is not a gerontic character.

Origin

Late 19th century: from Greek gerōn, geront- 'old man' + -ic.

Definition of gerontic in US English:

gerontic

adjectivejəˈrän(t)ik

Relating to old age, elderly people, or senescent animals or plants.
（人，动植物）老年的，衰老的
Example sentencesExamples
- Rapid growth of the inner and basal parts of the apertural margin during their late shell ontogeny caused twisting of the gerontic whorl both outwards and backwards.
- This interpretation is also indirectly supported by the close stratigraphic occurrence (Early and Middle Devonian) of these gastropod genera having such an unusual gerontic aperture.
- The increasingly low relief of the anterior border with a narrow curvature of the anterior border furrow close to the anterior branches of the facial suture is certainly a gerontic feature.
- The feature has been considered to be a gerontic characteristic and of no systematic importance.
- Specimens of Titanoplina were originally thought to be gerontic representatives of Proplina sibeliusi.
- In summary, examples of deviation from regular tight coiling during late shell stages and the development of a free gerontic whorl may be found in all known Cambrian-Devonian gastropod subclasses.
- A gerontic specimen, more than 8 mm wide, shows the development of high, elevated, bladelike accessory septa.
- The gerontic aperture is narrowly elongated in species of Eoscoliostoma, but rather circular in Scoliostoma species.
- A few large specimens were known in 1986, however, these were thought to represent gerontic individuals.
- These differences are not taken to be sufficient to merit recognition of a new species as they may be the result of ecophenotypic variations or gerontic developments in A. gigas.
- The new species has also established that the strong revolving internal rib of Endoptygma is not a gerontic character.
- The gerontic whorl of gastropod genera of the subfamily Mitchelliinae is twisted both outwards and backwards, but not upwards as in members of the subfamily Scoliostomatinae.
- However, this physical process cannot result in the simplification of septal folding in gerontic conchs.
- A permesothyrid foramen is commonly associated with globular, gerontic forms within a single species population.
- Scattered undulose presepiments, disrupting as many as ten major septa, present in some adult and all gerontic specimens.
- None of the morphotypes are identical to the forms of A. concentricus and A. tamurai, especially because the latter species has a posterior radial groove and irregular ribs in gerontic individuals.

Origin

Late 19th century: from Greek gerōn, geront- ‘old man’ + -ic.

词汇	gerontic
释义	Definition of gerontic in English: gerontic adjective dʒɛˈrɒntɪkjəˈrän(t)ik Relating to old age, elderly people, or senescent animals or plants. （人，动植物）老年的，衰老的 Example sentencesExamples The gerontic whorl of gastropod genera of the subfamily Mitchelliinae is twisted both outwards and backwards, but not upwards as in members of the subfamily Scoliostomatinae. These differences are not taken to be sufficient to merit recognition of a new species as they may be the result of ecophenotypic variations or gerontic developments in A. gigas. Rapid growth of the inner and basal parts of the apertural margin during their late shell ontogeny caused twisting of the gerontic whorl both outwards and backwards. In summary, examples of deviation from regular tight coiling during late shell stages and the development of a free gerontic whorl may be found in all known Cambrian-Devonian gastropod subclasses. A gerontic specimen, more than 8 mm wide, shows the development of high, elevated, bladelike accessory septa. A permesothyrid foramen is commonly associated with globular, gerontic forms within a single species population. Scattered undulose presepiments, disrupting as many as ten major septa, present in some adult and all gerontic specimens. The increasingly low relief of the anterior border with a narrow curvature of the anterior border furrow close to the anterior branches of the facial suture is certainly a gerontic feature. Specimens of Titanoplina were originally thought to be gerontic representatives of Proplina sibeliusi. None of the morphotypes are identical to the forms of A. concentricus and A. tamurai, especially because the latter species has a posterior radial groove and irregular ribs in gerontic individuals. However, this physical process cannot result in the simplification of septal folding in gerontic conchs. The gerontic aperture is narrowly elongated in species of Eoscoliostoma, but rather circular in Scoliostoma species. A few large specimens were known in 1986, however, these were thought to represent gerontic individuals. The feature has been considered to be a gerontic characteristic and of no systematic importance. This interpretation is also indirectly supported by the close stratigraphic occurrence (Early and Middle Devonian) of these gastropod genera having such an unusual gerontic aperture. The new species has also established that the strong revolving internal rib of Endoptygma is not a gerontic character. Origin Late 19th century: from Greek gerōn, geront- 'old man' + -ic. Definition of gerontic in US English: gerontic adjectivejəˈrän(t)ik Relating to old age, elderly people, or senescent animals or plants. （人，动植物）老年的，衰老的 Example sentencesExamples Rapid growth of the inner and basal parts of the apertural margin during their late shell ontogeny caused twisting of the gerontic whorl both outwards and backwards. This interpretation is also indirectly supported by the close stratigraphic occurrence (Early and Middle Devonian) of these gastropod genera having such an unusual gerontic aperture. The increasingly low relief of the anterior border with a narrow curvature of the anterior border furrow close to the anterior branches of the facial suture is certainly a gerontic feature. The feature has been considered to be a gerontic characteristic and of no systematic importance. Specimens of Titanoplina were originally thought to be gerontic representatives of Proplina sibeliusi. In summary, examples of deviation from regular tight coiling during late shell stages and the development of a free gerontic whorl may be found in all known Cambrian-Devonian gastropod subclasses. A gerontic specimen, more than 8 mm wide, shows the development of high, elevated, bladelike accessory septa. The gerontic aperture is narrowly elongated in species of Eoscoliostoma, but rather circular in Scoliostoma species. A few large specimens were known in 1986, however, these were thought to represent gerontic individuals. These differences are not taken to be sufficient to merit recognition of a new species as they may be the result of ecophenotypic variations or gerontic developments in A. gigas. The new species has also established that the strong revolving internal rib of Endoptygma is not a gerontic character. The gerontic whorl of gastropod genera of the subfamily Mitchelliinae is twisted both outwards and backwards, but not upwards as in members of the subfamily Scoliostomatinae. However, this physical process cannot result in the simplification of septal folding in gerontic conchs. A permesothyrid foramen is commonly associated with globular, gerontic forms within a single species population. Scattered undulose presepiments, disrupting as many as ten major septa, present in some adult and all gerontic specimens. None of the morphotypes are identical to the forms of A. concentricus and A. tamurai, especially because the latter species has a posterior radial groove and irregular ribs in gerontic individuals. Origin Late 19th century: from Greek gerōn, geront- ‘old man’ + -ic.
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