Antrum

(an/-trum) [L.]. A cavity or hollow space, especially in a bone. A. cardia cum, a dilatation of the lower end of the esophagus. It has been noted in cases of rumination, and in other conditions. A. ethmoid ale, the ethmoidal sinus. A. highmorianum, Antrum of High more, a cavity in the superior maxillary bone. A. highmori testis. See Mediastinum testis. A., Mastoid, the hollow space beneath the roof of the mastoid proce . A., Maxillary See A. highmorianum. A. pylori cum will is i i, the cavity of the pylorus. 70