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[in-vuh-loo-ker] /ˈɪn vəˌlu kər/
Botany. a collection or rosette of bracts subtending a flower cluster, umbel, or the like.
a covering, especially a membranous one.
Origin of involucre
1570-80; < Middle French < Latin involūcrum involucrum
Related forms
involucral, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for involucre


noun (pl) -cres, -cra (-krə)
a ring of bracts at the base of an inflorescence in such plants as the composites
Derived Forms
involucral, adjective
involucrate, adjective
Word Origin
C16 (in the sense: envelope): from New Latin involucrum, from Latin: wrapper, from involvere to wrap; see involve
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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involucre in Science
A series of bracts beneath or around a flower or flower cluster. The cupule, the cuplike structure holding an oak acorn, is a modified, woody involucre.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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