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 (kō′lē-ŏp′tĭl, kŏl′ē-)
A protective sheath enclosing the shoot tip and embryonic leaves of grasses.

[From New Latin coleoptilum : Greek koleon, sheath; see kel- in Indo-European roots + Greek ptilon, plume; see pet- in Indo-European roots.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Botany) a protective sheath around the plumule in grasses
[C19: from New Latin coleoptilum, from Greek koleon sheath + ptilon down, soft plumage]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˌkoʊ liˈɒp tɪl, ˌkɒl i-)

(in grasses) the first leaf above the ground, forming a sheath around the stem tip.
[1865–70; < New Latin coleoptilum < Greek koleó(n) sheath + ptílon soft feathers]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in periodicals archive ?
Pooled samples of 10 coleoptiles of each of the hybrids and their parental lines in two replications were used for extraction of crude enzymes except for ADH for which seed was used.
coleoptiles increased when exposed to light with a maximum about two
(1996) also observed increased coleoptiles speed of growth in wheat seedlings when they used A.
Andoh and Kobata [2] had shown that the length of coleoptiles and seminal roots of paddy sprouts was declined as the soil water potential was lower than -0.23 Mpa.
It also has the capacity to bind to fractions containing plasma membrane vesicles from maize coleoptiles.
Changes in soluble and cell wall bound peroxidase activities with growth in anoxia treated rice (oryza sativa L.) coleoptiles and roots.
Differential molecular responses of rice and wheat coleoptiles to anoxia reveal novel metabolic adaptations in amino acid metabolism for tissue tolerance.
The S-Metolachlor is absorbed through the coleoptiles of grasses and hypocotyl of broadleaves, and operates in the terminal bud in the process of cell division, inhibiting the synthesis of lipids, fatty acids, leaf waxes, terpenes, flavonoids and proteins, interfering with hormonal regulation, inhibiting the apical meristem and root.
In 1881, he and his son, Francis, reported on experiments performed with grass and oat coleoptiles in The Power of Movement in Plants.