dis·pel 
(dĭ-spĕl)
(dĭ-spĕl)tr.v. dis·pelled, dis·pel·ling, dis·pels
To break up, drive away, or cause to disappear: The breeze dispelled the bad odor. Her cheerfulness dispelled the gloom. The report dispelled my doubts. See Synonyms at scatter.
[Middle English dispellen, from Latin dispellere : dis-, apart; see DIS- + pellere, to drive; see pel-5 in the Appendix of Indo-European roots.]