periapical periodontal cyst n.
A cyst about the root of a dead tooth, usually caused by dental caries or disease of the pulp. Also called radicular cyst.
- Periapical radiograph
periapical radiograph n. A radiograph showing tooth apices and surrounding structures in a particular intraoral area.
- Periappendiceal abscess
periappendiceal abscess per·i·ap·pen·di·ce·al abscess (pěr’ē-ə-pěn’dĭ-sē’əl) n. See appendiceal abscess.
periappendicitis per·i·ap·pen·di·ci·tis (pěr’ē-ə-pěn’dĭ-sī’tĭs) n. An inflammation of the tissue that surrounds the vermiform appendix.
periapsis (pěr’ē-āp’sĭs) Plural periapsides (pěr’ē-āp’sĭ-dēz’) The point at which an orbiting object is closest to the body it is orbiting. This point is sometimes given a name that is specific to the body being orbited. For example, the periapsis of an object orbiting Earth is its perigee (from gaia, the Greek word for Earth), and […]