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

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

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

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

The hearing may be normal when the head is thrown far backward, for the fluid then escapes into the antrum, or when the chin is resting upon the chest.

From Mother's Remedies Over One Thousand Tried and Tested Remedies from Mothers of the United States and Canada by Ritter, Thomas Jefferson