amphetamine ampherotoky • amphiarthrodial · · · Info · Definitions · Synonyms · Characters · · amphetamine · · Text Latin · · Script 11 · · Length Definitions · · · (noun) a central nervous system stimulant that increases energy and decreases appetite; used to treat narcolepsy and some forms of depression. Synonyms: pep pill, upper, speed. · · Noun Definition 1 Synonyms · · · pep pill · · Synonym 1 upper · · Synonym 2 speed · · Synonym 3 Characters · · a latin small letter a U+0061 e latin small letter e U+0065 h latin small letter h U+0068 i latin small letter i U+0069 m latin small letter m U+006D n latin small letter n U+006E p latin small letter p U+0070 t latin small letter t U+0074