Origin of involucrum
1670–80; < New Latin, Latin involūcrum a wrap, cover, equivalent to involū- (variant stem of involvere to wrap, cover; see involute) + -crum instrumental suffix
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for involucrum
They have also always an involucrum below the298 calyx, but this involucrum differs in the different genera.
In the genus Malva, the involucrum consists of three leaflets, which in the common Mallow (Malva sylvestris) are oblong.
As the seeds ripen, the involucrum falls off, but the large loose-looking calyx remains on.
It belongs to that section of its numerous genus having an involucrum of stalked leaflets.
The leaves are triternate, divisions deeply cut and acute; the leaves of the involucrum are stalked, trifid, and deeply cut.
- An enveloping sheath or membrane, such as the sheath of new bone that forms around a sequestrum.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.