What is the meaning of Dis-?

Not, the reverse of. (Especially forming words with a negative connotation)

Expressing separation or removal.

Used as an intensifier.

Alternative form of dys- (incorrect)

dys- (bad)

indicates negation

dis-

shows separation, dissemination, e.g. semi (sow) > dissemi (disseminate) ; ŝiri (tear) > disŝiri (tear to pieces).

dis-

dis-

as intensifier

Romanization of 𐌳𐌹𐍃-

shows separation or dissemination

dis- (reversal, removal; apart)

Alternative form of dios-

dis-

asunder, apart, in two

reversal, removal

utterly, exceedingly

Forms words denoting reversal or removal; dis-, de-.

Intensifies words with a negative connotation; dis-, de-.

dis- (indicates separation)

dys- (forms the names of conditions characterised by difficult or inadequate function)

dys- (bad or wrong)

dis-

intensifying prefix

negative prefix

Source: wiktionary.org