thinner

ohenne (en-comparative of)
A liquid substance used to thin the consistency of another liquid.

''Turpentine or mineral spirits can be used as a thinner for oil based paints.

''Pomegranate juice and exercise are great natural blood thinners.

The new type of mechanical thinner allowed thinning of peach blossoms to be completed earlier.

A solid mane thinner is indispensable in finishing the looks of your horse.