frizz

Short definition from Wiktionary

Verb

1. 1
   Of hair, to form into a mass of tight curls.
2. 2
   To curl; to make frizzy.
3. 3
   To form into little burs, knobs, or tufts, as the nap of cloth.
4. 4
   To make (leather) soft and of even thickness by rubbing, as with pumice stone or a blunt instrument.
5. 5
   To fry, cook, or sear with a sizzling noise; to sizzle.

Noun

1. 1
   A mass of tightly curled or unruly hair.