a. and sb. Geom. rare. [ad. Gr. σπειρικ-ός, f. σπεῖρα SPIRE sb.3 Cf. F. spirique.] a. adj. Of or pertaining to, having the form of, a tore or torus. b. sb. A plane section of a torus.

1

1788.  T. Taylor, Proclus, I. 134. But, with respect to these sections, the conic were invented by Menæchmus,… But the spiric by Perseus.

2

1891.  in Cent. Dict.

3

  So † Spirical a. Obs.–1

4

1788.  T. Taylor, Proclus, I. 134. Conic, or spirical sections are generated from a particular section of solids.

5