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(biology) A bodily cavity, especially one having bony walls, especially one in the sinuses.
1964, GFF - Volume 86, page 343:
In forms with a modified outer antral fence, both this and the adjacent distal band of the domiciliar wall may be concave and form the antrum (Figs. 6 J-K; 7 B), and in some forms the antrum apparently is formed by the dolon alone (dolonal antrum).
“antrum”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
“antrum”, in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
antrum in Charles du Fresne du Cange’s Glossarium Mediæ et Infimæ Latinitatis (augmented edition with additions by D. P. Carpenterius, Adelungius and others, edited by Léopold Favre, 1883–1887)
antrum in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette.