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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)
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)]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.