Definition of fluid ounce noun from the Oxford Advanced Learner's Dictionary


fluid ounce

BrE BrE//ˌfluːɪd ˈaʊns//
; NAmE NAmE//ˌfluːɪd ˈaʊns//
(abbreviation fl oz)
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a unit for measuring liquids. There are 20 fluid ounces in a British pint and 16 in an American pint.
See the Oxford Advanced American Dictionary entry: fluid ounce