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The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Scaleback \Scale"back`\, n. (Zo["o]l.) Any one of numerous species of marine annelids of the family Polynoid[ae] , and allies, which have two rows of scales, or elytra, along the back. See Illust. under Ch[ae]topoda .

Wiktionary Word definitions in Wiktionary
n. 1 (context zoology English) Any member of numerous species of marine annelids of the Polynoidae family, with two rows of scales, or elytron, along the back. 2 An operation by which something is scaled back or reduced.