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Definition of: involucel
(in·vol′yə·sel) noun Bot.
1. A secondary involucre.
2. A rosette of bracts beneath a calyx. Also in·vol′u·cel′lum. [<NL involucellum, dim. of L involucrum covering]
A. Involucel of hollyhock; c, calyx; inv., involucel.
B. Head of thistle; in., involucre.
C. Section of thistle, showing arrangement of the scales (s) of the involucre, and the receptacle (r).
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