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/ˈæn.tɹəm/ · noun
(biology) 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).
Use antrum when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Antrum means (biology) A bodily cavity, especially one having bony walls, especially one in the sinuses..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
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).
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