dis·si·pate 
(dĭsə-pāt′)
(dĭsə-pāt′)v. dis·si·pat·ed, dis·si·pat·ing, dis·si·pates
v.tr.
1.
a. To break apart or attenuate to the point of disappearing: The wind finally dissipated the smoke. See Synonyms at scatter.
b. To drive away; cause to vanish: a discovery that dissipated his doubts.
2.
a. To spend or expend intemperately or wastefully; squander: dissipated his fortune in casinos.
b. To use up, especially recklessly; exhaust: dissipated their energy. See Synonyms at waste.
3. To cause to lose (energy, such as heat) irreversibly.
v.intr.
1. To be attenuated and vanish: The dark clouds finally dissipated.
2. To become dispelled; vanish: His anger dissipated in time.
[Middle English dissipaten, from Latin dissipāre, dissipāt-.]
dissi·pat′er, dissi·pa′tor n.
dissi·pa′tive adj.