WordWeb Online

1. Make thick or thicker
   "Thicken the sauce"
   - inspissate
    
2. Become thick or thicker
   "The sauce thickened"
   - inspissate
    
3. Make viscous or dense
   "thicken the sauce by adding flour"
   - inspissate

Derived forms: thickening, thickens, thickened

See also: thickener, thickening

Type of: alter, change, change integrity, change state, modify, turn

Antonym: thin