ascidian

noun
as·​cid·​i·​an | \ə-ˈsi-dē-ən \

Definition of ascidian 

: any of a class (Ascidiacea) of solitary or colonial sessile tunicates having an incurrent and excurrent siphon

called also sea squirt

First Known Use of ascidian

1823, in the meaning defined above

History and Etymology for ascidian

New Latin Ascidia, group comprising tunicates, from Ascidium, genus name, from Greek askidion, diminutive of askos wineskin, bladder

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The first known use of ascidian was in 1823

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