sb. and a. [f. Gr. σφόνδυλος, var. of σπόνδυλος: see SPONDYLE.] a. A solenoid. b. Solenoidal.
1852. Faraday, Exper. Res. Electr. (1855), III. 424. The magnet, with its surrounding sphondyloid of power. Ibid., 428. When … a magnet … is made into a horseshoe form, we see at once that the lines of force and the sphondyloids are greatly distorted. Ibid., 422, note. The sphondyloid body.
