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Antrum: In biology this is a general term for a chamber or cavity that can have meaning that is specific when referenced to certain sites in the body or organs.

In vertebrates for example it can mean: antrum cardiacum – which is a dilation occurring in the esophagus near the stomach; antrum follicularum is the hollow in the epithelium that encloses the oocyte; mastoid antrum, is a cavity in between the temporal bone in the skull and the middle ear; stomach antrum, the preliminary part of the pyloric portion of the stomach, this is what usually is referred to as the “antrum” in matters associated to the stomach; Antrum of the Highmore or maxillary antrum, is the maxillary sinus cavity in the maxilla and the largest of the paranasal sinuses.

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