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prophyll

noun
pro·​phyll | \ ˈprōˌfil\
variants: or less commonly prophyllum \ prōˈfiləm \
plural prophylls\ -​lz \ also prophylla\ -​lə \

Definition of prophyll 

: a plant structure resembling a leaf (as a bracteole) or consisting of a modified or rudimentary leaf (as a foliar primordium)

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History and Etymology for prophyll

New Latin prophyllum, from pro- entry 1 + -phyllum

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