diluent

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diluent

[′dil·yə·wənt]
(chemistry)
An inert substance added to some other substance or solution so that the volume of the latter substance is increased and its concentration per unit volume is decreased.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

thinner, dilutent, solvent

A volatile liquid used to dilute and lower the viscosity of paints, adhesives, etc.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
References in periodicals archive ?
Additional control experiments involved the use of procedures similar to those described above except for the replacement of the primary antiserum with either 1% normal mouse or rabbit serum or with the serum dilutant alone.
Also, the air acts as a dilutant for any volatile solvent emissions which are present with all makes of ink jet systems.
Embassy Foreign Agricultural Service report, "largely as a result of increased use of chicory as a dilutant or substitute for coffee," with around 40,000 metric tons of chicory mixed with coffee annually.