adjective

1. readily flowing; fluid; specif., having its molecules moving freely with respect to each other so as to flow readily, unlike a solid, but because of cohesive forces not expanding indefinitely like a gas
2. clear; limpid liquid eyes
3. flowing smoothly and musically, gracefully, etc. liquid verse
4. in cash or readily convertible into cash liquid assets
5. Phonet. articulated without friction and capable of being prolonged like a vowel, as (l) and (r)

Etymology: OFr liquide < L liquidus < liquere, to be liquid, prob. < IE base *wlikw-, wet > Welsh gwlyb, moist

noun

1. a liquid substance
2. a liquid sound