scaleback(Noun)

Any member of numerous species of marine annelids with two rows of scales, or elytra, along the back.

scaleback(Noun)

An operation by which something is scaled back or reduced.

Budgetary constraints led to a scaleback in quality.

Scaleback(noun)

any one of numerous species of marine annelids of the family Polynoidae, and allies, which have two rows of scales, or elytra, along the back. See Illust. under Chaetopoda