different between cotyledon vs macrocephalous

English

Etymology

From Latin cotyl?d?n, from Ancient Greek ????????? (kotul?d?n, “cup-shaped cavity”), from ?????? (kotúl?, “cup”).

Pronunciation

• (UK) IPA^(key): /k?t??li?dn?/
• (US) IPA^(key): /?k?t?l?i?dn?/

Noun

cotyledon (plural cotyledons)

1. (physiology) Each of the patches of vili on the foetal chorion in the placenta of ruminants and some other mammals.
   • 1997, Roy Porter, The Greatest Benefit to Mankind, Folio Society 2016, p. 72:

     Forced to apply animal findings to humans, his human womb also had cotyledons like a dog's.

2. (botany) The leaf of the embryo of a seed-bearing plant; after germination it becomes the first leaves of the seedling.

Synonyms

• seed leaf

Derived terms

Translations

English

Etymology

macro- +? -cephalous

Adjective

macrocephalous (comparative more macrocephalous, superlative most macrocephalous)

1. Having a large head.
2. Having the cotyledons of a dicotyledonous embryo confluent, and forming a large mass compared with the rest of the body.