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