The definition of a gown is a long, loose-fitting dress or robe.
(noun)See gown in Webster's New World College Dictionary
noun
Origin: ME goune < OFr < LL gunna, loose robe, orig., fur cloak
transitive verb
See gown in American Heritage Dictionary 4
noun
Origin:
Origin: Middle English goune
Origin: , from Old French
Origin: , from Late Latin gunna, leather garment
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