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coleoptile

co·le·op·tile [ klee ópt'l, kòllee ópt'l ] (plural co·le·op·tiles)


noun 
Definition:
 
first leaf in grasses: the first leaf in some grasses that forms a protective sheath around the stem tip plumule

[Mid-19th century. < Greek koleos "sheath" + ptilon "feather"]
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