rough·en 
(rŭfən)
(rŭfən)tr. & intr.v. rough·ened, rough·en·ing, rough·ens
To make or become rough.
- carbohydrate
- carbohydrate loading
- carbolated
- carbolic acid
- carbo-load
- car bomb
- carbon
- carbon-12
- carbon-14
- carbon-14 dating
- carbonaceous
- carbonado
- carbonado
- carbonara
- carbonate
- carbonated water
- carbonation
- carbonator
- carbon black
- carbon copy
- carbon cycle
- carbon-date
- carbon dating
- carbon dioxide
- carbon disulfide