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Webster 1913 Edition

Noun.

(Zool.)

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

See also: scale back

scaleback ‎(plural scalebacks)

(zoology) Any member of numerous species of marine annelids of the Polynoidae family, with two rows of scales, or elytra, along the back.
An operation by which something is scaled back or reduced.
Budgetary constraints led to a scaleback in quality.