Osculatrix \Os`cu*la"trix\, n.; pl. {Osculatrixes}. [NL.]
(Geom.)
A curve whose contact with a given curve, at a given point,
is of a higher order (or involves the equality of a greater
number of successive differential coefficients of the
ordinates of the curves taken at that point) than that of any
other curve of the same kind.
[1913 Webster]