## cusps

Noun

- plural form of
*cusp*

- In the insectivorous type, as exemplified in moles and shrew-mice, the middle pair of incisors in each jaw are long and pointed so as to have a forceps-like action for seizing insects, the hard coats of which are broken up by the numerous sharp
**cusps**surmounting the cheek-teeth. - A more generally accepted view - especially among palaeontologists - is the tritubercular theory, according to which the most generalized type of tooth consists of three
**cusps**arranged in a triangle, with the apex pointing inwards in the teeth of the upper jaw. - Additions of extra
**cusps**form teeth of a more complicated type. - In regard to the ordinary singularities, we have m, the order, n „ class, „ number of double points,
**Cusps**, T double tangents, inflections; and this being so, Pliicker's ” six equations ” are n = m (m - I) -2S -3K, = 3m (m - 2) - 6S- 8K, T=Zm(m -2) (m29) - (m2 - m-6) (28-i-3K)- I -25(5-1) +65K-1114 I), m =n(n - I)-2T-3c, K= 3n (n-2) - 6r -8c, = 2n(n-2)(n29) - (n2 - n-6) (2T-{-30-1-2T(T - I) -1-6Tc -}2c (c - I). - For the reciprocal curve these letters denote respectively the order, class, number of nodes,
**cusps**, double tangent and inflections.

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