noun, plural an·tra [an-truh] /ˈæn trə/. Anatomy.
- a cavity in a body organ, especially a bone.
noun plural -tra (-trə)
- anatomy a natural cavity, hollow, or sinus, esp in a bone
“a cave or cavity,” late 14c., medical Latin, from Greek antron “cave.”
n. pl. an•tra (-trə)
- A nearly closed cavity or chamber, especially in a bone.
- The pyloric end of the stomach, partially shut off during digestion from the cardiac end by sphincter muscles in the stomach wall.