in·vo·lu·crum
(ĭn′və-lo͞o′krəm)n. pl. in·vo·lu·cra (-krə) An enveloping sheath or envelope, such as the sheath of new bone that forms around a sequestrum.
[New Latin involūcrum, from Latin, wrapper, envelope, from involvere, to enwrap; see involve.]
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.
in•vo•lu•cre
(ˈɪn vəˌlu kər)
n. 1. a collection or rosette of bracts subtending a flower cluster, umbel, or the like.
2. a covering, esp. a membranous one.
[1570–80; < Middle French < Latin
involūcrum a wrapper, cover <
involū-, variant s. of
involvere (see
involve)]
in`vo•lu′cral, adj.
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