rare. [f. SPHEROID sb. + -ISM.] The fact of being a spheroid.
1728. Chambers, Cycl., s.v. Earth, Mons. Cassini has found, that the Degrees of a Meridian grow larger, the further we go towards the Line by one Eight hundredth Part of every Degree; which puts the Spheroidism of the Earth past Question.
1903. Engineer, 9 Jan., 42/3. Most makers of flash boilers repudiate the idea that spheroidism manifests itself.
