cu·pule | \ ˈkyü-(ˌ)pyül 
\
\Definition of cupule
: a cup-shaped anatomical structure: such as
a : an involucre characteristic of the oak in which the bracts are indurated and coherent
b : an outer integument partially enclosing the seed of some seed ferns
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Time Traveler for cupule
The first known use of cupule was in 1826
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