[co.le.op.tile] n [NL coleoptilum, fr. Gk koleon + ptilon down; akin to Gk pteron] (ca. 1866): the first leaf of a monocotyledon forming a protective sheath about the plumule
COLEOPTILE
Meaning of COLEOPTILE in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012