Definition of allantoidean in English:

allantoidean

(also allantoidian)

adjective

Embryology
  • Embryology= "allantoic".

Origin

Mid 19th century (in an earlier sense). From post-classical Latin allantoideus + -an. In some forms after French allantoïdien.

Pronunciation

allantoidean

/ˌalənˈtɔɪdɪən/