involucre
Concise Oxford English Dictionary © 2008 Oxford University Press:
involucre /ˈɪnvəl(j)uːkə/
▶noun
- 1 Anatomy a membranous envelope.
- 2 Botany a whorl of bracts surrounding an inflorescence or at the base of an umbel.
'involucre' also found in these Oxford entries:

