Normal. Regular; natural; as it ought to be.
Nymphæ. The labia interna; two lateral folds of mucous membrane within the labia externa.
Obstetrics. Midwifery.
Obturator foramen. An opening between the pubic and ischiatic arches closed by a membranous ligament.
Occiput. The hinder part of the skull or head.
Odontalgia. Toothache.
Œdema. Swelling from the presence of serum in the areolar tissue.
Œsophagus. The gullet.
Officinal. Authorized by the Pharmacopœia.
Omentum. The caul; a peritoneal fold covering the bowels.