different between polynoidae vs scaleback

English

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.

From the verb phrase scale back.

scaleback (plural scalebacks)

An operation by which something is scaled back or reduced.
Budgetary constraints led to a scaleback in quality.

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