antro-, antr- +

(Greek: cave, cavern; in medicine, of or pertaining to a [bodily] cavity or sinus; a term in anatomical nomenclature, especially to designate a cavity or chamber within a bone)

antritis (s) (noun) (no pl)
Inflammation of an antrum: In medical school, Grace learned about antritis as the swelling and soreness of the maxillary sinus that is the air-filled region behind the cheekbones: Antritis is often caused by bacterial or viral infections or allergies.
antrum (s) (noun), antrums; antra (pl)
A general term for cavity or chamber which may have specific meaning in reference to certain organs or sites in the body: An antrum is a cavity or hollow within a bone.

An antrum can be a normal dilatation within certain hollow organs; such as, the pyloric end of the stomach.

The antrum of the stomach (gastric antrum) is a portion before the outlet which is lined by mucosa which does not produce acid. The paranasal sinuses can be referred to as the frontal antrum, ethmoid antrum, and maxillary antrum.

atticoantrotomy (s) (noun), atticoantrotomies (pl)
An operation that opens the mastoid antrum and the attic of the middle ear; antroatticotomy: Dr. New toldMr Old that it would be necessary to have an atticoantrotomy, because of his chronic infections and extra tissue growth in the middle ear of his right ear.

A cross reference of other word family units that are related directly, indirectly, or partially with: "opening, hole, cavity, tract, tube": alveolo-; anu-; celo-; coelio-; concho-; fenestra-; hernio-; hiat-; meato-; ora-; parieto-; poro-; pyl-, pyle-; pylor-; sphinctero-; splanchn-; stomato-; syringo-; uretero-; urethro-; vagino-; ventricul-.