triphalangia

tri·pha·lan·gi·a

(trī'fă-lan'jē-ă),
Malformation in which three phalanges are present in the thumb or great toe.
[tri- + phalanx]
Farlex Partner Medical Dictionary © Farlex 2012

triphalangia

(trī″fă-lăn′jē-ă) [″ + phalanx, closely knit row]
A deformity marked by the presence of three phalanges in a thumb or great toe.
Medical Dictionary, © 2009 Farlex and Partners