syndactyli

from The Century Dictionary.

• In ornithology: In some systems, as those of Illiger, Cuvier, and others, a group of insessorial birds, having the front toes extensively coherent, as is well illustrated in the kingfisher family.
• In Vieillot's system, a group of sea-birds, having all four toes webbed; the totipalmate or steganopodous birds, now forming the order Steganopodes.
• [lowercase] Plural of syndactylus, 2.