polydactylism

Ancient Greek πολύς (polús, “many”) + δάκτυλος (dáktulos, “finger”); compare French polydactylisme.

polydactylism (usually uncountable, plural polydactylisms)

1. (anatomy) The possession of more than the normal number of digits.
   • 2008, Guinness World Records — Human Body — Extreme Bodies — Most Fingers and Toes — Living Person‎:

     Devendra Harne, pictured above, (India; born January 9, 1995) also has 25 in total (12 fingers and 13 toes) as a result of the condition polydactylism.

• polydactyly
• hyperdactyly