Definition of cotyledon in English:

cotyledon

noun ˌkɒtɪˈliːd(ə)nˌkɑdəˈlidn

1Botany
An embryonic leaf in seed-bearing plants, one or more of which are the first leaves to appear from a germinating seed.
〔植〕子叶
Example sentencesExamples
- The cotyledons are the ‘seed leaves’ produced by the embryo.
- The layer between seed coat and cotyledon probably includes the wall of the embryo sac.
- They are present on the stems, leaves, cotyledons, rachises, pedicles, bracts and calyces.
- However, protein biosynthesis in the axis organs and cotyledons of dicotyledonous seeds commences much earlier.
- Mutants of this class display shortened hypocotyls and small cotyledons after irradiation of seed.
Synonyms
frond
2A succulent plant of the stonecrop family, some kinds of which are grown as ornamentals.
长筒莲（景天科植物，某些品种供观赏）
Genus Cotyledon and related genera, family Crassulaceae: several species

Derivatives

cotyledonary

adjective

Seedlings at the vegetative cotyledonary stage, about 7-10 days old, were transplanted into plastic pots containing the same medium.
Example sentencesExamples
- In the first attempts to achieve embryo-to-plantlet conversion, 16-week-old cotyledonary stage embryos (including 2 weeks pretreatment) were selected for use as experimental material.
- In contrast, in seedlings grown in vitro, growth of the cotyledonary tissue, shoot and root was observed with growth in the root appearing later and proceeding more slowly than in the shoot.
- Three chlorophyll readings were made and averaged on the middle leaflet of the first trifoliate of soybean, the second true leaf of lettuce (counting up from the cotyledonary leaves) and the second leaf of wheat.
- Further development of cotyledonary embryo showing closed vascular system and characteristic cotyledonary notches.

cotyledonous

adjective

Origin

Mid 16th century (denoting a patch of villi on the placenta of mammals): from Latin, 'navelwort' (which has cup-shaped leaves), from Greek kotulēdōn 'cup-shaped cavity', from kotulē 'cup'.

Rhymes

cedarn, dicotyledon, Eden, monocotyledon, Sweden

Definition of cotyledon in US English:

cotyledon

nounˌkɑdəˈlidnˌkädəˈlēdn

Botany

An embryonic leaf in seed-bearing plants, one or more of which are the first leaves to appear from a germinating seed.
〔植〕子叶
Example sentencesExamples
- Mutants of this class display shortened hypocotyls and small cotyledons after irradiation of seed.
- The cotyledons are the ‘seed leaves’ produced by the embryo.
- The layer between seed coat and cotyledon probably includes the wall of the embryo sac.
- However, protein biosynthesis in the axis organs and cotyledons of dicotyledonous seeds commences much earlier.
- They are present on the stems, leaves, cotyledons, rachises, pedicles, bracts and calyces.
Synonyms
frond

Origin

Mid 16th century (denoting a patch of villi on the placenta of mammals): from Latin, ‘navelwort’ (which has cup-shaped leaves), from Greek kotulēdōn ‘cup-shaped cavity’, from kotulē ‘cup’.

词汇	cotyledon
释义	Definition of cotyledon in English: cotyledon noun ˌkɒtɪˈliːd(ə)nˌkɑdəˈlidn 1Botany An embryonic leaf in seed-bearing plants, one or more of which are the first leaves to appear from a germinating seed. 〔植〕子叶 Example sentencesExamples The cotyledons are the ‘seed leaves’ produced by the embryo. The layer between seed coat and cotyledon probably includes the wall of the embryo sac. They are present on the stems, leaves, cotyledons, rachises, pedicles, bracts and calyces. However, protein biosynthesis in the axis organs and cotyledons of dicotyledonous seeds commences much earlier. Mutants of this class display shortened hypocotyls and small cotyledons after irradiation of seed. Synonyms frond 2A succulent plant of the stonecrop family, some kinds of which are grown as ornamentals. 长筒莲（景天科植物，某些品种供观赏） Genus Cotyledon and related genera, family Crassulaceae: several species Derivatives cotyledonary adjective Seedlings at the vegetative cotyledonary stage, about 7-10 days old, were transplanted into plastic pots containing the same medium. Example sentencesExamples In the first attempts to achieve embryo-to-plantlet conversion, 16-week-old cotyledonary stage embryos (including 2 weeks pretreatment) were selected for use as experimental material. In contrast, in seedlings grown in vitro, growth of the cotyledonary tissue, shoot and root was observed with growth in the root appearing later and proceeding more slowly than in the shoot. Three chlorophyll readings were made and averaged on the middle leaflet of the first trifoliate of soybean, the second true leaf of lettuce (counting up from the cotyledonary leaves) and the second leaf of wheat. Further development of cotyledonary embryo showing closed vascular system and characteristic cotyledonary notches. cotyledonous adjective Origin Mid 16th century (denoting a patch of villi on the placenta of mammals): from Latin, 'navelwort' (which has cup-shaped leaves), from Greek kotulēdōn 'cup-shaped cavity', from kotulē 'cup'. Rhymes cedarn, dicotyledon, Eden, monocotyledon, Sweden Definition of cotyledon in US English: cotyledon nounˌkɑdəˈlidnˌkädəˈlēdn Botany An embryonic leaf in seed-bearing plants, one or more of which are the first leaves to appear from a germinating seed. 〔植〕子叶 Example sentencesExamples Mutants of this class display shortened hypocotyls and small cotyledons after irradiation of seed. The cotyledons are the ‘seed leaves’ produced by the embryo. The layer between seed coat and cotyledon probably includes the wall of the embryo sac. However, protein biosynthesis in the axis organs and cotyledons of dicotyledonous seeds commences much earlier. They are present on the stems, leaves, cotyledons, rachises, pedicles, bracts and calyces. Synonyms frond Origin Mid 16th century (denoting a patch of villi on the placenta of mammals): from Latin, ‘navelwort’ (which has cup-shaped leaves), from Greek kotulēdōn ‘cup-shaped cavity’, from kotulē ‘cup’.
随便看	in administration inadmissibilities inadmissibility inadmissibility inadmissible inadmissibly inadmissibly in-a-door in advance in advance in advance of in advance of inadvertence inadvertence inadvertences inadvertencies inadvertency inadvertency inadvertent inadvertently inadvertently inadvisabilities inadvisability inadvisability inadvisable