noun, plural an·tra [an-truh] /ˈæn trə/. Anatomy.
Origin of antrum
Related formsan·tral, adjective
Examples from the Web for antrum
The preliminary preparation, the position of the patient, and the instruments required are the same as in opening the antrum.
They are both on the floor of the antrum, the round posterior corner and the narrow acute corner in front.
Antrum duplicatum, 1-loculare, superne apertum, pericarpiis osseis intus nidulantibus.The Botanical Magazine Vol. 8|William Curtis
As soon as the antrum is reached, pus will be seen to ooze through the opening made, especially if it is under tension.
In my opinion, however, it is always wiser in such cases to open the antrum.