Also found in: Medical.


A secondary involucre, as at the base of an umbel within a compound umbel.

[New Latin involūcellum, diminutive of involūcrum, involucre; see involucrum.]
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.


(ɪnˈvɒljʊˌsɛl) or


n, pl -cels or -cella (-ˈsɛlə)
(Botany) a ring of bracts at the base of the florets of a compound umbel
[C19: from New Latin involūcellum a little cover; see involucre]
inˌvoluˈcellate, inˌvoluˈcellated adj
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
References in periodicals archive ?
Traditionally, the main morphological differences for identifying these 11 local-used Chaihu are the characters observed from their original plants: the width of involucel bracts, the shape of leaves, the number of umbellules and the vitta number at the vallecula and commissure of fruits; and the characters from the major morphological features of their dried roots: the shape and texture of roots, straight or detached, the color of root and cut surface, with/without fiber-like petiole residues, rich in xylem fiber or not.
Traditionally, the characteristics of involucel bracts and cauline leaves were the major identified characteristics of these three species.