syndactyly

noun

1. (countable, uncountable)The normal condition, in some animals and birds, of having fused digits.
2. (countable, uncountable)The anomalous condition, in humans, of having some fingers or toes fused with a web.

   “Pranamya Menaria (India; born August 10, 2005) has 25 in total (12 fingers and 13 toes). This is as a result of the condition Polydactyly and Syndactyly.”

   “Fig. 2.2f.1 Complete syndactyly. Schematic (A) shows syndactyly of hand excluding the thumb. The thumb may be included in the syndactyly, as evident in the left hand of the patient with Apert syndrome (B). The great toe is usually included in syndactyly of the foot.”

   “Complex syndactylies are more often part of a syndrome such as Apert, Carpenter, or Saethre-Chotzen syndrome.”