coleoptile

noun
co·le·op·tile | \ ˌkō-lē-ˈäp-tᵊl \

Definition of coleoptile 

: the first leaf of a monocotyledon forming a protective sheath about the plumule

First Known Use of coleoptile

circa 1866, in the meaning defined above

History and Etymology for coleoptile

New Latin coleoptilum, from Greek koleon + ptilon down; akin to Greek pteron

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The first known use of coleoptile was circa 1866

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