Meaning

noun a substance that is fluid at room temperature and pressure

noun continuous amorphous matter that tends to flow and to conform to the outline of its container: a liquid or a gas

adjective subject to change; variable

originEtymology tree Proto-Indo-European *bʰel-der. Proto-Indo-European *bʰlewH-der. Proto-Indo-European *bʰluH-yé-ti? Latin fluō Proto-Indo-European *dʰeh₁-der. Proto-Italic *-iðos Latin -idus Latin fluidusder. Middle English fluid English fluid From Middle English fluid, from Latin fluidus (“flowing; fluid”), from Latin fluō (“to flow”), from Proto-Indo-European *bʰleh₁- (“to swell; surge; overflow;…

Etymology from Wiktionary, CC BY-SA 3.0