**An`al*lag*mat"ic** (#), a. [Gr. priv. + a change.] Math.

Not changed in form by inversion.

Anallagmatic curves, a class of curves of the fourth degree which have certain peculiar relations to circles; -- sometimes called *bicircular quartics**. -- Anallagmatic surfaces, a certain class of surfaces of the fourth degree.
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*© Webster 1913.*