Definitions for "Antrum"
A cavern or cavity, esp. an anatomical cavity or sinus
any nearly closed cavity or chamber, especially one within a bone, such as a sinus
A fluid-filled space between the follicle cells, the development of which marks the transformation of a tertiary follicle from a secondary follicle. Composes the bulk of the mature, preovulatory follicle (sometimes called the Graafian follicle) and very obvious on transvaginal ultrasound scanning during monitoring of follicular development as dark, "echolucent" spaces within the ovary.
Keywords:  pylorus, widest, stomach, part, lower
"J"-shaped, widest part of the stomach; located between body of stomach and pylorus
Lower Part Of The Stomach