2 entries under this word

Fluid

Flū'id, a.

adjective

a. [Lat. fluidus, from fluere, to flow; Fr. fluide, Sp. & It. fluido.] Having particles which easily move and change their relative position without a separation of the mass, and which easily yield to pressure; capable of flowing; liquid or gaseous.

Flū'id, n.

noun

n. A body whose particles move easily among themselves, and yield to the least force impressed, and which, when that force is removed, recovers its previous form.

☞ Fluid is a generic term, including liquids and gases as species. Water, air, and steam are fluids.