The Collaborative International Dictionary
Melanian
Melanian \Me*la"ni*an\, n. (Zo["o]l.) One of a family of fresh-water pectinibranchiate mollusks, having a turret-shaped shell.
Wiktionary
melanian
n. (context zoology English) One of a family of freshwater pectinibranchiate mollusks with a turret-shaped shell.