Source : Webster's Revised Unabridged Dictionary (1913)

Embryonic \Em`bry*on"ic\, 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}.

Embryonic \Em`bry*on"ic\, 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}.

Source : WordNet®

embryonic
     adj 1: of or relating to an embryo; "the embryonic membrane" [syn:
            {embryonal}]
     2: of an organism prior to birth or hatching; "in the embryonic
        stage"; "embryologic development" [syn: {embryologic}, {embryonal}]
     3: in an early stage of development; "the embryo government
        staffed by survivors of the massacre"; "an embryonic
        nation, not yet self-governing" [syn: {embryotic}]