des-
Pronunciation: des
Definition: chemistry a prefix indicating absence of some component of the principal part of the name; largely replaced by “de-” (deoxyribonucleic acid, dehydro-) but retained where “de-” could be taken for d- or d-, as part of “desmo-” (desmosterol), and in such terms as desoxycortone.
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Examples: glitazone, GI cocktail, etc.
