Definition of nucellus in English:

nucellus

nounPlural nucelli njuːˈsɛləsˌn(y)o͞oˈseləs

Botany

The central part of an ovule, containing the embryo sac.
〔植〕（胚珠）珠心
Example sentencesExamples
- Ovules consisted of an outer integument that surrounded the inner integument to form the micropyle, with the inner integument surrounding the nucellus and embryo sac.
- A nucellar dome has been formed in the massive nucellar cap and the integument has overgrown the nucellus and formed a wide-open micropyle.
- Diboll and Larson report that there are no plasmodesmata connecting the nucellus to the embryo sac.
- Other barriers may also exist because xylem-mobile safranin failed to enter the ovary although the xylem passes around the nucellus and into the stylar tissue.
- In addition, the grains were observed to float in water with sacci uppermost, consistent with the suggestion that distally placed sacci serve to orientate the germinal furrow of the pollen grain towards the nucellus of an inverted ovule.

Derivatives

nucellar

adjective njuːˈsɛlən(j)uˈsɛlər

Botany

Relating to the central part of an ovule, containing the embryo sac.
〔植〕（胚珠）珠心
nucellar tissue surrounding the embryo sac
Example sentencesExamples
- Such grains frequently had a portion of the pollen tube outside the nucellar tissue so that the grains were held at an angle some distance from the nucellus.
- Most of the wheat consumed by humans is processed from white flour, which is produced by milling to remove the germ and bran (pericarp, testa, nucellar layer, and aleurone layer).
- A nucellar dome has been formed in the massive nucellar cap and the integument has overgrown the nucellus and formed a wide-open micropyle.

Origin

Late 19th century: modern Latin, apparently an irregular diminutive of nucleus.

Definition of nucellus in US English:

nucellus

nounˌn(y)o͞oˈseləs

Botany

The central part of an ovule, containing the embryo sac.
〔植〕（胚珠）珠心
Example sentencesExamples
- Ovules consisted of an outer integument that surrounded the inner integument to form the micropyle, with the inner integument surrounding the nucellus and embryo sac.
- Diboll and Larson report that there are no plasmodesmata connecting the nucellus to the embryo sac.
- A nucellar dome has been formed in the massive nucellar cap and the integument has overgrown the nucellus and formed a wide-open micropyle.
- Other barriers may also exist because xylem-mobile safranin failed to enter the ovary although the xylem passes around the nucellus and into the stylar tissue.
- In addition, the grains were observed to float in water with sacci uppermost, consistent with the suggestion that distally placed sacci serve to orientate the germinal furrow of the pollen grain towards the nucellus of an inverted ovule.

Origin

Late 19th century: modern Latin, apparently an irregular diminutive of nucleus.

词汇	nucellus
释义	Definition of nucellus in English: nucellus nounPlural nucelli njuːˈsɛləsˌn(y)o͞oˈseləs Botany The central part of an ovule, containing the embryo sac. 〔植〕（胚珠）珠心 Example sentencesExamples Ovules consisted of an outer integument that surrounded the inner integument to form the micropyle, with the inner integument surrounding the nucellus and embryo sac. A nucellar dome has been formed in the massive nucellar cap and the integument has overgrown the nucellus and formed a wide-open micropyle. Diboll and Larson report that there are no plasmodesmata connecting the nucellus to the embryo sac. Other barriers may also exist because xylem-mobile safranin failed to enter the ovary although the xylem passes around the nucellus and into the stylar tissue. In addition, the grains were observed to float in water with sacci uppermost, consistent with the suggestion that distally placed sacci serve to orientate the germinal furrow of the pollen grain towards the nucellus of an inverted ovule. Derivatives nucellar adjective njuːˈsɛlən(j)uˈsɛlər Botany Relating to the central part of an ovule, containing the embryo sac. 〔植〕（胚珠）珠心 nucellar tissue surrounding the embryo sac Example sentencesExamples Such grains frequently had a portion of the pollen tube outside the nucellar tissue so that the grains were held at an angle some distance from the nucellus. Most of the wheat consumed by humans is processed from white flour, which is produced by milling to remove the germ and bran (pericarp, testa, nucellar layer, and aleurone layer). A nucellar dome has been formed in the massive nucellar cap and the integument has overgrown the nucellus and formed a wide-open micropyle. Origin Late 19th century: modern Latin, apparently an irregular diminutive of nucleus. Definition of nucellus in US English: nucellus nounˌn(y)o͞oˈseləs Botany The central part of an ovule, containing the embryo sac. 〔植〕（胚珠）珠心 Example sentencesExamples Ovules consisted of an outer integument that surrounded the inner integument to form the micropyle, with the inner integument surrounding the nucellus and embryo sac. Diboll and Larson report that there are no plasmodesmata connecting the nucellus to the embryo sac. A nucellar dome has been formed in the massive nucellar cap and the integument has overgrown the nucellus and formed a wide-open micropyle. Other barriers may also exist because xylem-mobile safranin failed to enter the ovary although the xylem passes around the nucellus and into the stylar tissue. In addition, the grains were observed to float in water with sacci uppermost, consistent with the suggestion that distally placed sacci serve to orientate the germinal furrow of the pollen grain towards the nucellus of an inverted ovule. Origin Late 19th century: modern Latin, apparently an irregular diminutive of nucleus.
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