noun, plural blen·nies.
- any of several fishes of the family Blenniidae and related families, especially of the genus Blennius, having a long, tapering body and small pelvic fins inserted before the pectoral fins.
noun plural -nies
- any blennioid fish of the family Blenniidae of coastal waters, esp of the genus Blennius, having a tapering scaleless body, a long dorsal fin, and long raylike pelvic fins
- any of various related fishes
1774, from Latin blennius (in Pliny), from Greek blennos, from blenna “slime, mucus,” from PIE *mled-sno-, from root *mel- “soft.” The fish so called from the coating on its scales.