INVOLUCRUM

involucrum. Involucrum, n. a calyx remote from the flower as at the origin of an umber

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‖In′vo‐lu″crum (?), n.; pl. L. Involucra (#), E. Involucrums (#). [[L. See Involucre.]] 1. 1. (Bot.) See Involucre.
2. 2. (Zoöl.) A sheath which surrounds the base of the lasso cells in the Siphonophora.