fluid ounce

noun
a measure of capacity equal to 1/16 (0.0625) pint (29.6 milliliters) in the U.S., and equal to 1/20 (0.05) of an imperial pint (28.4 milliliters) in Great Britain. Abbreviation: fl. oz; Symbol: f

Origin:
1880–85

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Collins
World English Dictionary
fluid ounce
 
n
a unit of capacity equal to the volume of one avoirdupois ounce of distilled water at 62°F: there are twenty fluid ounces in an Imperial pint and sixteen in a US pint

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

fluid ounce or fluidounce
n.
Abbr. fl oz, fl. oz.
A unit of volume or capacity equal to 8 fluid drams or 29.57 milliliters.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
fluid ounce  
A unit of liquid volume or capacity in the US Customary System equal to 1/16 of a pint (29.57 milliliters). See Table at measurement.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
When it expands, it weighs less per fluid ounce, quart or gallon than the cold liquid above it.
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