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.

thinner, dilutent, solvent

A volatile liquid used to dilute and lower the viscosity of paints, adhesives, etc.
References in periodicals archive ?
Special components have been added to boar semen diluents in an effort to prevent or retard unwanted alterations in the structure and function of plasma membranes.