involucra
involucrum的複數形
In·vo·lu·crum n.; pl. L. Involucra E. Involucrums
1. Bot. See Involucre.
2. Zool. A sheath which surrounds the base of the lasso cells in the Siphonophora.
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involucre
n : a highly conspicuous bract or bract pair or ring of bracts
at the base of an inflorescence
[also: involucra (pl)]