diluent

DILUENT, a. [L. See Dilute.]

1. Making liquid or more fluid; making thin; attenuating.

2. Weakening the strength of, by mixture with water.

DILUENT, n.

1. That which thins or attenuates; that which makes more liquid.

2. That which weakens the strength of; as water, which, mixed with wine or spirit, reduces the strength of it.