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The Collaborative International Dictionary of English v.0.48:

Attenuant \At*ten"u*ant\, a. [L. attenuans, p. pr. of attenuare: cf. F. att['e]nuant. See Attenuate.] Making thin, as fluids; diluting; rendering less dense and viscid; diluent. -- n. (Med.) A medicine that thins or dilutes the fluids; a diluent. [1913 Webster]