corcle

from The Collaborative International Dictionary of English v.0.48

Corcle \Cor"cle\ (k[^o]r"k'l), Corcule \Cor"cule\ (-k[-u]l), n.
   [L. corculum a little heart, dim. of cor heart.] (Bot.)
   The heart of the seed; the embryo or germ. [Obs.]
   [1913 Webster]