fluid

Reading level: hard

Estimated CEFR level: C1 — Advanced

Estimated from word frequency; not an official CEFR classification.

Definition

  1. noun a substance that is fluid at room temperature and pressure
  2. noun continuous amorphous matter that tends to flow and to conform to the outline of its container: a liquid or a gas
  3. adjective subject to change; variable

Etymology

From Middle English fluid, from Latin fluidus (“flowing; fluid”), from Latin fluō (“to flow”), from Proto-Indo-European *bʰleh₁- (“to swell; surge; overflow; run”). Akin to Ancient Greek φλύειν (phlúein, “to swell; overflow”). Not related to English flow, which is a native, inherited word from *plew-, but is distantly related from English bleat.

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