plumule sheath

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• coleoptile — noun Etymology: New Latin coleoptilum, from Greek koleon + ptilon down; akin to Greek pteron Date: circa 1866 the first leaf of a monocotyledon forming a protective sheath about the plumule …   New Collegiate Dictionary

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• coleorhiza — noun A sheath like structure found in a plant seed that connects the coleoptile to the primary root and acts as a protective covering enclosing the plumule and radicle …   Wiktionary