Flu″id (flūĭd), a. [L. fluidus, fr. fluere to flow: cf. F. fluide. See Fluent.] 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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.