involucrum

[in-vuh-loo-kruhm]
noun, plural involucra [in-vuh-loo-kruh] .

Origin:
1670–80; < Neo-Latin, Latin involūcrum a wrap, cover, equivalent to involū- (variant stem of involvere to wrap, cover; see involute) + -crum instrumental suffix

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World English Dictionary
involucre or involucrum (ˈɪnvəˌluːkə, ˌɪnvəˈluːkrəm)
 
n , pl -cres, -cra
a ring of bracts at the base of an inflorescence in such plants as the composites
 
[C16 (in the sense: envelope): from New Latin involucrum, from Latin: wrapper, from involvere to wrap; see involve]
 
involucrum or involucrum (ˈɪnvəˌluːkə, ˌɪnvəˈluːkrəm, -krə)
 
n
 
[C16 (in the sense: envelope): from New Latin involucrum, from Latin: wrapper, from involvere to wrap; see involve]
 
invo'lucral or involucrum
 
adj
 
invo'lucrate or involucrum
 
adj

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American Heritage
Medical Dictionary

involucrum in·vo·lu·crum (ĭn'və-lōō'krəm)
n. pl. in·vo·lu·cra (-krə)
An enveloping sheath or membrane, such as the sheath of new bone that forms around a sequestrum.

The American Heritage® Stedman's Medical Dictionary
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Example sentences
At separation from service the osteomyelitis was inactive with no involucrum or sequestrum.
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