Pl. -a. [L., a. Gr. ἄντρον cave.] A hollow place, a cavern; spec. applied in Phys. to cavities in the body.
1398. Trevisa, Barth. De P. R., XIV. liii. (1495), 486. A derke caue hyghte Antrum.
1727–51. Chambers, Cycl., Antrum Highmorianum is a cavity discovered within the sinus of each maxillary bone.
1842. E. Wilson, Anat. Vade M., 33. The … antrum of Highmore.
1877. Huxley, Anat. Inv. Anim., vii. 388. The nasal cavities and maxillary antra of Carnivores.
