noun Botany.
a secondary involucre, as in a compound cluster of flowers.

1755–65; < Neo-Latin involūcellum, diminutive of Latin involūcrum involucrum; for formation, see castellum

involucelate [in-vol-yuh-sel-it] , involucelated [in-vol-yuh-sel-ey-tid] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
involucel or involucellum (ɪnˈvɒljʊˌsɛl, ɪnˌvɒljʊˈsɛləm)
n , pl -cels, -cella
a ring of bracts at the base of the florets of a compound umbel
[C19: from New Latin involūcellum a little cover; see involucre]
involucellum or involucellum (ɪnˈvɒljʊˌsɛl, ɪnˌvɒljʊˈsɛləm, -ˈsɛlə)
[C19: from New Latin involūcellum a little cover; see involucre]
involu'cellate or involucellum
involu'cellated or involucellum

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Bractlets of the involucel are many and shorter than the spreading pedicels.
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