- A circular, domed, portable tent used by the nomadic Mongols of central Asia.蒙古包、毡包：中亚蒙古族牧民使用的一种圆顶可移动的帐篷
- Russian yurta 俄语 yurta
- [of Turkic origin] [源于突厥语]
- orthogonal
- orthogonal projection
- orthogonals
- orthographic
- orthographical
- orthographic projection
- orthographies
- orthography
- orthomolecular
- orthopaedics
- orthopedics
- orthopsychiatry
- orthopteran
- orthopterans
- orthoptics
- orthorhombic
- orthoscopic
- orthostatic
- orthotics
- orthotropic
- orthotropous
- orting
- Ortles
- ortolan
- ortolans