A liquid; matter in a liquid state; occasionally in wider sense, a fluid. Obsolete in general sense.

Used in many descriptive names in Pharmacy and Chemistry, with sense of: Liquid, solution. See esp. aqua fortis, n., aqua mirabilis, n., aqua regia…

Liquid; vapour. gen. Any liquid; drink. Now rare.

In plural. Fluids. Obsolete. rare.

concrete. That which flows; a quantity of fluid matter; sap.

Chemistry and Medicine. = aqua, n.1

Something that is fluid, a fluid mass; (in plural) the humours (of the body). Also: a fluid state, fluidity, esp. with regard to substances…

A substance whose particles move freely among themselves, so as to give way before the slightest pressure.

A liquid substance (see A. 1a). In plural often = liquid food.