lancelet

noun
lance·​let | \ˈlan(t)-slət \

Definition of lancelet 

: any of a subphylum (Cephalochordata) of small translucent marine primitive chordate animals that are fishlike in appearance and usually live partially buried on the ocean floor

called also amphioxus

First Known Use of lancelet

circa 1836, in the meaning defined above

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The first known use of lancelet was circa 1836

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lancelet

noun
lance·​let | \ˈlan(t)-slət \

Medical Definition of lancelet 

: any vertebrate animal of the subphylum Cephalochordata

called also amphioxus

More from Merriam-Webster on lancelet

Britannica.com: Encyclopedia article about lancelet

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