ac·​ro·​cyst | \ ˈa-krō-ˌsist\
plural -s

Definition of acrocyst

: a chitinous cystlike expansion of the gonophore at the top of the gonotheca in certain hydroids

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First Known Use of acrocyst

1864, in the meaning defined above

History and Etymology for acrocyst

acr- + -cyst

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The first known use of acrocyst was in 1864

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