• (a.) Of or pertaining to the Ophidiidae, a family of fishes which includes many slender species. • (n.) One of the Ophidiidae.
O·phid'i·oid adjective [ Ophidion + -oid .] (Zoology) Of or pertaining to the Ophidiidæ , a family of fishes which includes many slender species. -- noun One of the Ophidiidæ . 
ophidioid Resembling or descriptive of snakes.