polynemid
/ˌpɒlɪˈniːmɪd/Zoology
noun
Any of various fishes constituting the tropical family Polynemidae, having pectoral fins divided into two parts, the lower of which consists of several long rays; a threadfin.
adjective
Of or relating to fishes of the family Polynemidae.
Origin
Late 19th century; earliest use found in Isaac Funk (1839–1912), publisher and reformer. From scientific Latin Polynemus, genus name + -id, after scientific Latin Polynemidae, family name.