WordWeb Online

1. The act of diluting something
   "the thinning of paint with turpentine";
   - cutting

1. Lose thickness; become thin or thinner
    
2. Make thin or thinner
   "Thin the solution"
    
3. Lessen the strength or flavour of a solution or mixture
   - dilute, thin out, reduce, cut
    
4. Take off weight
   - reduce, melt off, slim, slenderize, slim down, slenderise [Brit], lose weight

Derived forms: thinnings

Type of: bring down, change state, cut, cut back, cut down, dilution, reduce, trim, trim back, trim down, turn, weaken

Antonym: thicken

Encyclopedia: Thinning