Resembling, characteristic of, or relating to cattle or cows.
From 'cow' + '-y' (adjectival suffix), forming a descriptive adjective in English. This is a straightforward nominal derivation common in English word formation.
The word 'cowy' isn't common, but farmers use descriptive adjectives like it all the time to communicate quickly—'that field has a cowy smell' or 'he's got a cowy build' are the kinds of shortcuts people develop in tight communities with specific expertise.
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