acraein

noun
acrae·​in | \ə-ˈkrē-ən\
plural -s

Definition of acraein 

: a self-defensive substance secreted by butterflies of the subfamily Acraeinae that is distasteful to birds and other predators

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First Known Use of acraein

1922, in the meaning defined above

History and Etymology for acraein

New Latin Acraeinae + English -in

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The first known use of acraein was in 1922

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