Jacquemier's sign - koilonychia
- JNC-VI
- JND
- JNK
- JNP
- JNPA
- JNPV
- jnt
- JOAG
- JOAV
- job
- Job syndrome
- Job syndrome
- Jobert de Lamballe
- Jobert fossa
- Jobert fossa
- JOC
- Jocasta complex
- jock itch
- jockstrap
- JOD
- Jod-Basedow phenomenon
- Jod-Basedow, jodbasedow
- jodbasedow
- JODM
- Joest bodies
- Joest bodies
- Joffroy
- Joffroy reflex
- Joffroy reflex
- Jogger's nails
- jogger's nipple
- Johanson-Blizzard syndrome
- Johanson-Blizzard syndrome
- Johne
- Johne bacillus
- Johne bacillus disease
- Johne disease
- Johne's bacillus
- Johne's disease
- johnin
