Noah Webster
Diluent
DILUENT, adjective [Latin See Dilute.]
1. Making liquid or more fluid; making thin; attenuating.
2. Weakening the strength of, by mixture with water.
DILUENT, noun
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.