The Collaborative International Dictionary of English v.0.48:

Cicatricle \Cic"a*tri`cle\, n. [Cf. F. cicatricule, fr. L.
   cicatricula a small scar, fr. cicatrix a scar.] (Biol.)
   The germinating point in the embryo of a seed; the point in
   the yolk of an egg at which development begins.
   [1913 Webster]