Meaning of hypocotyl

hy•po•cot•yl

Pronunciation: (hī"pu-kot'l), [key]
— n. Bot.
  1. the part of a plant embryo directly below the cotyledons, forming a connection with the radicle. See diag. under
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.