- necktie
- necromancy, astrology and medicine, etc, arts of
- necrophaga
- necrophage
- necroptosis
- necrosis
- necrosis of the femoral head
- necrotic ring spot
- necrotizing external
- necrotizing fasciitis
- NECSI
- NECT
- nectar
- Nectarian System
- Nectaris Basin
- nectary
- NED
- NEDCC
- NEDLIB
- nedocromil
- nedocromil; tilade
- need
- Needham
- Needham Research Institute
- Needing You