1. 密切：osculating sphere 密切球面 | osculation 密切 | osculatory 密切的
2. 密切;接触：osculation plane 密切面 | osculation 密切;接触 | osculatory 接触线
3. 接吻：osculate 接吻 | osculation 接吻 | osculatory 接吻的
4. 密切;吻切：吻切轨道 osculating orbit | 密切;吻切 osculation | 柱霰石 oserskite
noun
1. the act of caressing with the lips (or an instance thereof)
2. (mathematics) a contact of two curves (or two surfaces) at which they have a common tangent