oater

[ oh-ter ]
/ ˈoʊ tər /

noun Slang.

a movie, television show, etc., about the frontier days of the U.S. West; western; horse opera.

Origin of oater

First recorded in 1945–50; oat + -er1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019