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The verb is derived from Late Middle English glenen (“to gather (heads of grain left by reapers), glean; to gather (things) together, collect”), from Old French glener, glainer (modern French glaner (“to gather, glean”)), from Late Latin glen(n)are, the present active infinitive of glen(n)ō (“to make a collection”); further etymology uncertain, possibly from Gaulish, from Proto-Celtic *glanos (“clean; clear”, adjective), ultimately from Proto-Indo-European *ǵʰleh₁- (“to glow, shine; to be glowing or shining”). The noun is derived from Late Middle English glene (“collection of heads of grain gathered by gleaning; head of grain”), from Old French glene, glane (“act of gleaning; legal right to glean”) (modern French glane (“act of gleaning”)), from glener, glainer (verb): see above. Cognate with Medieval Latin glana, glena (“bundle of ears of grain”).

Possibly a variant of clean (“(UK, dialectal; noun) the afterbirth of a cow or sheep; (verb) of a cow or sheep: to bring forth the afterbirth”), possibly from clean (“to remove dirt from an object or place”), referring to an animal’s uterus being cleaned out by the delivery of the afterbirth.