coleoptilen.
/kɒliːˈɒptɪl/ Botany.
= coleophyll n. Also attributive.
ΚΠ
1866 J. Lindley & T. Moore Treasury Bot. Coleophyll, or Coleoptile, the first leaf which follows the cotyledon in endogens, and ensheaths the succeeding leaves.
1923 Nature 7 July 26/1 The coleoptile (sheathed plumule or young stem) of barley seedlings.
1937 Discovery June 174/1 Putting a block of auxin-charged agar on one side of a coleoptile stump.
This entry has not yet been fully updated (first published 1891; most recently modified version published online September 2021).
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n.1866