Webster’s Revised Unabridged Dictionary · 1913
Embryonic
Em′bry·on′ic (·ŏn′ĭk), a. (Biol.) Of or pertaining to an embryo; embryonal; rudimentary.
Embryonic sac or vesicle (Bot.), the vesicle within which the embryo is developed in the ovule; — sometimes called also amnios sac, and embryonal sac.