ORMC - Pacinian corpuscle
- Ortho crutch
- Ortho Dienestrol
- Ortho Evra
- Ortho Tri-Cyclen
- ortho-
- Ortho- (prefix)
- ortho-, orth-
- ortho-acid
- Ortho-Cept
- Ortho-Cyclen
- Ortho-Est
- Ortho-Novum
- Ortho-Prefest
- ortho-tolueno-azo-beta-naphthol
- orthoacid
- orthobiosis
- orthoboric acid
- Orthobunyavirus
- orthocaine
- orthocephalic
- orthocephalous
- orthochorea
- orthochromatic
- orthochromatic dye
- orthochromic
- orthochromophil
- orthochromophil, orthochromophile
- Orthoclone OKT3
- orthocranic
- orthocrasia
- orthocresol
- orthocresol phthalein
- orthocytosis
- orthodactylous
- orthodentin
- orthodeoxia
- orthodiagram
- orthodiagraph
- orthodiagraphy
- orthodichlorobenzene
