WordReference Random House Unabridged Dictionary of American English © 2026
a•tre•sia
(ə trē′zhə, -zhē ə),USA pronunciation n. [Med.]
a•tre•sic
(ə trē′zik, -sik),USA pronunciation a•tret•ic
(ə tret′ik),USA pronunciation adj.
- Pathologythe congenital absence, or the pathological closure, of an opening, passage, or cavity.
- Greek a- a-6 + três(is) perforation + -ia -ia
- Neo-Latin
- 1800–10;