antrum

American  

[an-truhm] / ˈæn trəm /

noun

Anatomy.

plural

antra

1. a cavity in a body organ, especially a bone.

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antrum British  

/ ˈæntrəm /

noun

1. anatomy a natural cavity, hollow, or sinus, esp in a bone

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Other Word Forms

• antral adjective

Etymology

Origin of antrum

1720–30; < Latin < Greek ántron cave

Example Sentences

This degradation of the wall, combined with pressure from the large, fluid-filled antrum, results in the expulsion of the oocyte surrounded by granulosa cells into the peritoneal cavity.

From Textbooks • Jun. 19, 2013

Early tertiary follicles with their fluid-filled antrum will be stimulated by an increase in FSH, a gonadotropin produced by the anterior pituitary, to grow in the 28-day ovarian cycle.

From Textbooks • Jun. 19, 2013

The wider end of the funnel, the pyloric antrum, connects to the body of the stomach.

From Textbooks • Jun. 19, 2013

These bony caverns are called the frontal, maxillary or antrum, ethmoid and sphenoid sinuses.

From Time Magazine Archive

I found the tumor occupying the whole of the antrum.

From New, Old, and Forgotten Remedies: Papers by Many Writers by Anshutz, Edward Pollock