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noun Involucre n. (Bot.) (a)A whorl or set of bracts around a flower, umbel, or head. (b)A continuous marginal covering of sporangia, in certain ferns, as in the common brake, or the cup-shaped processes of the filmy ferns. (c)The peridium or volva of certain fungi. Called also involucrum.
Collaborative International Dictionary of English 0.48
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