What is the meaning of Des-?

Obsolete form of dis- (reversal of sense of succeeding word).

A removal of a group from a molecule.

dis-; expresses separation, reversal, or negation.

indicates the negation of a verb; dis-, un-

alternative form of dez-

dis-, de-

des-

dis-

des-

dis-

Expresses the opposite of the root word.

de-; dis-

alternative form of dis-

de-; dis-

de-; dis-

dis-

de-; dis-

un-; de-; dis- (forms verbs indicating the reversal of the prefixed verb)

un- (forms nouns indicating the lack or opposite of the prefixed noun)

misspelling of dis-

dis-, de-

dis-; indicative of a negative

Source: wiktionary.org