swordtail

noun
sword·​tail | \ˈsȯrd-ˌtāl \

Definition of swordtail 

: a small brightly marked Central American live-bearer (Xiphophorus helleri of the family Poeciliidae) often kept in tropical aquariums and bred in many colors

First Known Use of swordtail

1858, in the meaning defined above

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The first known use of swordtail was in 1858

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