polynoid
/ˌpɒlɪˈnəʊɪd/Zoology
noun
Any of various errant polychaete worms constituting the family Polynoidae, having a flattened body with a series of plates or elytra covering most of the dorsal surface; a scale worm.
adjective
Of or relating to the family Polynoidae.
Origin
Late 19th century; earliest use found in American Naturalist. From scientific Latin Polynoe, genus name + -id, after scientific Latin Polynoidae, family name.