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Definition of COLEOPTILE. : the first leaf of a monocotyledon forming a protective sheath about the plumule.
1 The hypocotyl is the part of the plant embryo BETWEEN the cotyledon & the radicle. 2  The hilium is a scar along the seed edge where it was attached to the ovary. 3  In monocot seeds like corn, a sheath called the coleoptile grows out of the ground to protect the newly emerging plant.