osculatrix
/ˈɒskjʊlətrɪks/ /ˌɒskjʊˈleɪtrɪks/Now rare
noun
Geometry. A curve or surface that osculates another curve or surface.
Origin
Mid 19th century; earliest use found in Charles Davies (1798–1876). From classical Latin ōsculāt-, past participial stem of ōsculārī osculate + -trix.