Source : Webster's Revised Unabridged Dictionary (1913)

Germinal \Ger"mi*nal\, a. [See {Germ}.]
   Pertaining or belonging to a germ; as, the germinal vesicle.

   {Germinal layers} (Biol.), the two layers of cells, the
      ectoblast and entoblast, which form respectively the outer
      covering and inner wall of the gastrula. A third layer of
      cells, the mesoblast, which is formed later and lies
      between these two, is sometimes included.

   {Germinal membrane}. (Biol.) Same as {Blastoderm}.

   {Germinal spot} (Biol.), the nucleolus of the ovum.

   {Germinal vesicle}, (Biol.), the nucleus of the ovum of
      animals.