cotyledon (n.)youdaoicibaDictYouDict[cotyledon 词源字典]
from 1540s, in various sense, from Latin cotyledon "pennywort, navelwort," from Greek kotyledon "cup-shaped cavity," from kotyle "hollow thing, small vessel," also the name of a small liquid measure (nearly a half-pint); which is of uncertain origin. Botanical sense is 1776, from Linnaeus (1751).[cotyledon etymology, cotyledon origin, 英语词源]
dicotyledonyoudaoicibaDictYouDict
"A flowering plant with an embryo that bears two cotyledons (seed leaves). Dicotyledons constitute the larger of the two great divisions of flowering plants, and typically have broad stalked leaves with net-like veins (e.g. daisies, hawthorns, oaks)", Early 18th century: from modern Latin dicotyledones (plural), from di- 'two' + cotyledon (see cotyledon).
acotyledonyoudaoicibaDictYouDict
"A plant with no distinct seed leaves, especially a fern or moss", Mid 18th century: from modern Latin plural acotyledones (see a-1, cotyledon).