Noah Webster
Liquid
LIQ'UID, adjective [Latin liquidus, from liquo, to melt; lix and lug.]
1. Fluid; flowing or capable of flowing; not fixed or solid. But liquid is not precisely synonymous with fluid. Mercury and air are fluid, but not liquid
2. Soft; clear; flowing; smooth; as liquid melody.
3. Pronounced without any jar; smooth; as a liquid letter.
4. Dissolved; not obtainable by law; as a liquid debt. obsolete
LIQ'UID, noun
1. A fluid or flowing substance; a substance whose parts change their relative position on the slightest pressure, and which flows on an inclined plane; as water, wine, milk, etc.
2. In grammar, a letter which has a smooth flowing sound, or which flows smoothly after a mute; as l and r, in bla, bra. M and n are also called liquids.