What does zygodactylous mean?
Zy godactylous, pronounced with primary stress on the third syllable, describes a foot or animal whose toes are arranged in two opposing pairs: two point forward and two point backward. This arrangement is characteristic of woodpeckers and many other climbing birds, although it also occurs in some non-avian animals. The unusual configuration helps the animal grip branches and other surfaces securely. In general writing, the shorter and more familiar adjective zygodactyl is often preferred, while zygodactylous is especially likely to appear in specialist zoological descriptions. The word is useful because it gives a precise name to a distinctive form of digit arrangement that differs from the usual forward-facing arrangement of many birds' toes. It belongs primarily to scientific and descriptive vocabulary rather than everyday speech, but it makes anatomical and zoological writing more exact.
adjectiveHaving the digits of the foot arranged in two pairs, with two toes directed forward and two backward.
- Having two toes directed forward and two directed backward.
"The woodpecker's zygodactylous toes give it a firm grip as it climbs a tree."
"The bird's zygodactylous foot is adapted for gripping branches and climbing trunks."
"Zoologists described the arrangement of the digits as zygodactylous."
A woodpecker's zygodactylous toes are split two forward and two backward, turning a tree trunk into a staircase.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of zygodactylous
The word combines the Greek roots zygon, meaning yoke, and daktylos, meaning finger. These elements refer to the paired arrangement of the toes, with each opposing pair resembling the two arms of a yoke. The term entered English in zoological usage for describing this characteristic arrangement of digits.
Related word forms
How zygodactylous is actually used
This is a technical zoological adjective, used especially for birds and other animals whose feet have a paired, opposing arrangement of the toes.