An Etymological Dictionary of Astronomy and Astrophysics

The state of matter in which a substance exhibits a characteristic readiness to flow, little or no tendency to disperse, and relatively high incompressibility.

Etymology (EN): O.Fr. liquide, from L. liquidus “fluid, liquid, moist,” from liquere
“be fluid,” related to liqui “to melt, flow.”

Etymology (PE): Âvé, from âv, variant of âb “→ water” + nuance suffix -e.
Âbgun literally “resembling water,” from âb “water,” +
gun “resembling; manner, fashion; color”
(Mid.Pers. gônak “kind, species;” Av. gaona- “color”).