hexad

The American Illustrated Medical Dictionary · 1913 · p. 12

(heks’ad) (Gr. ξξ six]. Any sexivalent element hexradactylisnr (heks-ah-dak’til-izm) [Gr. ξξ six + δάκτυλος finger]. The occurrence of six TS (or toes) on a hand (or foot)..