Longman Dictionary of Contemporary English homepage

Language: Old French
Origin: des-, from Latin dis-, from dis 'apart'

dis-

 prefix
     
dis-
1 shows an opposite or negative:
I disapprove (=do not approve)
dishonesty (=lack of honesty)
2 [in verbs] shows the stopping or removing of a condition:
Disconnect the machine.
Disinfect the wound.
Definition from the Longman Dictionary of Contemporary English
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