syndactyly

/S IH1 N D AE1 K T IH0 L IY0/
noun
  1. 1

    The normal condition, in some animals and birds, of having fused digits.

  2. 2

    The anomalous condition, in humans, of having some fingers or toes fused with a web.

Synonyms

Source: https://en.wiktionary.org/wiki/syndactyly