US Liquid Measure: 8 Make a Fluid Ounce
Puzzle 16 of At the Ballet Hard Pack
Question is: US Liquid Measure: 8 Make a Fluid Ounce
and the answer is: FLUIDDRAM
Word Meaning:
FLUID — Any substance which can flow with relative ease, tends to assume the shape of its container, and obeys Bernoulli's principle; a liquid, gas or plasma.
Definitions from Wiktionary.