Definition of button mushroom
:a usually small white mushroom (Agaricus bisporus synonym A. brunnescens) in which the pileus has not yet expanded
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button mushroom
noun
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First Known Use of button mushroom
1865
BUTTON MUSHROOM Defined for English Language Learners
button mushroom
noun
Definition of button mushroom for English Language Learners
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: a small, white mushroom that is often eaten as a vegetable
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