- J
- jaborandi, jaborandi folia (Br.)
- Jaborine
- Jaboulay' button, Murphy button
- Jaboulay's button
- Jaboulay's button's method
- Jaboulay's button's operation
- Jaboulay-Brian method
- jacaranda
- Jaccoud's sign
- jacket
- Jacksohnian epilepsy
- Jackson's epilepsy
- Jackson's epilepsy's rule
- Jackson's epilepsy's sign
- Jackson's epilepsy's syndrome
- Jackson's membrane or veil
- Jackson's pectoral syrup
- Jackson's sign
- Jacob's membrane