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noun
1.A membranous envelope.![](//www.tdict.com/IMG/sk1.png)
2.A whorl or rosette of bracts surrounding an inflorescence (especially a capitulum) or at the base of an umbel.![](//www.tdict.com/IMG/sk1.png)
‘The Hermaphrodite cyathium shows the characteristics measured (length and width of the cyathium involucre and the nectary).’
‘The cupules are simple involucres of bracts which are spirally arranged (according to a Fibonacci pattern) on the floral axis preceding the flower.’
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