Demerol demeritoriously • demersal · · · Info · Definitions · Synonyms · Characters · · Demerol · · Text Latin · · Script 7 · · Length Definitions · · · (noun) a synthetic narcotic drug (trade name Demerol) used to treat pain. Synonyms: meperidine, meperidine hydrochloride. · · Noun Definition 1 Synonyms · · · meperidine · · Synonym 1 meperidine hydrochloride · · Synonym 2 Characters · · D latin capital letter d U+0044 e latin small letter e U+0065 l latin small letter l U+006C m latin small letter m U+006D o latin small letter o U+006F r latin small letter r U+0072