From The Collaborative International Dictionary of English v.0.48:

Osculatrix \Os`cu*la"trix\, n.; pl. Osculatrixes. [NL.]
   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]
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