/ gaʊn; NAmE / noun
1.
a woman's dress, especially a long one for special occasions :
an evening / wedding gown
2.
a long loose piece of clothing that is worn over other clothes by judges and (in Britain) by other lawyers, and by members of universities (at special ceremonies) :
a graduation gown
3.
a piece of clothing that is worn over other clothes to protect them, especially in a hospital :
a surgeon's gown
—see also dressing gown
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WORD ORIGIN
Middle English : from Old French goune , from late Latin gunna fur garment; probably related to Byzantine Greek gouna fur, fur-lined garment.