1. dis- a prefix occurring orig. in loanwords from Latin with the meanings “apart, asunder” (disperse; dissociate; dissolve ); now frequent in French loanwords and English coinages having a privative, negative, or reversing force relative to the base noun, verb, or adjective: disability; disarm; disconnect; dishearten; dishonest; dislike; disobey.; dissyllable.
Etymology: (< L (akin to bis, Gk dís twice); often r. des- < OF)
1. dis- indicates the opposite meaning; = not to disapprove of sth; a dishonest and disloyal person
Definition of 'Dis-'
Webster Dictionary
1. Dis-
2. Dis- a prefix from the Latin, whence F. des, or sometimes de-, dis-. The Latin dis-appears as di-before b, d, g, l, m, n, r, v, becomes dif-before f, and either dis-or di- before j. It is from the sameroot as bis twice, and duo, E. two. See Two, and cf. Bi-, Di-, Dia-. Dis-denotes separation, a parting from, as in distribute, disconnect; hence it often has the force of a privative and negative, as in disarm, disoblige, disagree. Also intensive, as in dissever
Definitions of Dis- 
