1. Synthetic narcotic drug similar to morphine but less habit-forming; used in narcotic detoxification and maintenance of heroin addiction
   - methadone, methadone hydrochloride, methadon, fixer, synthetic heroin

Type of: narcotic

• family Nepenthaceae
• family Nephropsidae
• family Nepidae
• family Neritidae
• family Nidulariaceae
• family Nitrobacteriaceae
• family Noctuidae
• family Nostocaceae
• family Notonectidae
• family Notoryctidae
• family Nummulitidae
• family Nyctaginaceae
• family Nymphaeaceae
• family Nymphalidae
• family Nyssaceae
• family Ochnaceae
• family Ochotonidae
• family Octopodidae
• family Odobenidae
• family Odontaspididae
• family Oedogoniaceae
• family Oestridae
• family Ogcocephalidae
• family Oleaceae
• family Oleandraceae