ETYM Latin liquidus, from liquere to be fluid or liquid; cf. Skr. rî to ooze, drop, lî to melt.
1. Existing as or have characteristics of a liquid; especially tending to flow.
2. Clear and bright; SYN. limpid.
3. Filled or brimming with tears; SYN. swimming, watery.
4. Smooth and flowing in quality; entirely free of harshness.
5. Yielding; lacking any hint of hardness.

1. A substance in the fluid state of matter having no fixed shape but a fixed volume.
2. A substance that is liquid at room temperature and pressure.
3. The state in which a substance exhibits a characteristic readiness to flow with little or no tendency to disperse and relatively high incompressibility; SYN. liquidness, liquidity.
4. (Linguistics) A frictionless non-nasal continuant (especially 'l' and 'r').
State of matter between a solid and a gas. A liquid forms a level surface and assumes the shape of its container. Its atoms do not occupy fixed positions as in a crystalline solid, nor do they have freedom of movement as in a gas. Unlike a gas, a liquid is difficult to compress since pressure applied at one point is equally transmitted throughout (Pascal's principle). Hydraulics makes use of this property.