pileolen.
/ˈpʌɪlɪəʊl/, U.S. /ˈpaɪliˌoʊl/ Botany. Now rare.
A cap-like sheath formed by the cotyledon around the plumule of a grass or sedge.
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the world > plants > particular plants > fungi > [noun] > parts of
pileus1760
hat1775
rind1788
spherule1796
Rhizomorpha1802
stipe1821
peridium1823
umbo1836
ambrosia1840
holdfast1841
rhizomorph1848
peridiole1857
trama1857
pileole1858
pileolus1858
byssus1866
rhabdus1866
conidiophore1874
appressorium1897
1858 R. G. Mayne Expos. Lexicon Med. Sci. (1860) 963/2 Pileola..name given by Mirbel to a perfectly close primordial leaf, having the form of a funnel, and which covers and hides the other leaves of the gemmule, as in the Scirpus: a pileole.
1880 C. Darwin & F. Darwin Power of Movement in Plants 62 With the Gramineæ the part which first rises above the ground has been called by some the pileole.
1917 W. W. Robbins Bot. Crop Plants x. 104 The growing point and foliage leaves are surrounded by a leaf sheath, the coleoptile or pileole.
This entry has been updated (OED Third Edition, March 2006; most recently modified version published online March 2022).
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