Definition of redside in English:

redside

(also redsides)

noun

US
  • 1(More fully "redside dace") a small cyprinid, Clinostomus elongatus.

  • 2The rainbow trout, Oncorhynchus mykiss.

  • 3(More fully "redside shiner") any of several minnows; especially Richardsonius balteatus.

Origin

Late 19th century; earliest use found in Michigan General Statutes.