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fluid ounce

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. Symbol: f.
Abbreviation: fl. oz;
Origin of fluid ounce
First recorded in 1880-85 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for fluid ounce

fluid ounce

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 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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fluid ounce in Medicine

fluid ounce or fluidounce
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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fluid ounce in Science
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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