nounpl. -·tra or -·trums
Anat. a cavity, esp. one within a bone, as either of a pair of sinuses in the upper jaw
Origin of antrumClassical Latin from Classical Greek antron, cave from Indo-European an unverified form antrom
- A cavity or chamber, especially one in a bone.
- Either of the sinuses in the bones of the upper jaw, opening into the nasal cavity.
Origin of antrumLate Latin cavity in the body from Latin cave from Greek antron
From Latin antrum, from Ancient Greek ἄντρον (antron, “cave”).