—n.
1 a substance, esp. a gas or liquid, lacking definite shape and capable of flowing and yielding to the slightest pressure.
2 a fluid part or secretion.
—adj.
1 able to flow and alter shape freely.
2 constantly changing or fluctuating (the situation is fluid).
3 (of a clutch, coupling, etc.) in which liquid is used to transmit power.
Phrases and idioms:
fluid drachm see DRACHM. fluid ounce see OUNCE(1).
Derivatives:
fluidify v.tr. (-ies, -ied). fluidity n. fluidly adv. fluidness n.
Etymology: F fluide or L fluidus f. fluere flow
Useful english dictionary. 2012.