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Antrum

//ˈæn.tɹəm// noun

Definitions

Noun
  1. 1
    A bodily cavity, especially one having bony walls, especially one in the sinuses.

    "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)."

  2. 2
    a natural cavity or hollow in a bone wordnet

Etymology

From Latin antrum, from Ancient Greek ἄντρον (ántron, “cave”). Doublet of antre.

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