What does unguligrade mean?
Unguligrade is a specialized zoological adjective for an animal or a mode of locomotion in which the body's weight is carried on the ends of the digits, as in horses and other hoofed mammals. The word is chiefly used in anatomy and comparative studies of movement, especially when classifying feet as plantigrade, digitigrade, or unguligrade. A plantigrade animal places the whole sole, including the heel, on the ground; a digitigrade animal bears weight on the toes with the heel raised; an unguligrade animal walks on hoofed terminal digits. Although unguligrade can sometimes evoke tiptoeing in people, it is not the normal word for that everyday action. Its combination of Latin ungula, meaning hoof, and gradus, meaning step, makes it especially useful in precise descriptions of mammalian locomotion and provides a memorable link between its form and meaning.
adjectiveRelating to or denoting locomotion in which the weight is borne on the tips of the toes or on hooves, as in hoofed mammals.
- Relating to walking or standing on the tips of the toes or on hooves, especially in hoofed mammals.
"Unlike humans, the horse is unguligrade, carrying its weight on the ends of its toes."
"The zoologist classified the horse as unguligrade because its weight is carried on the terminal digits of its feet."
"The fossil's foot anatomy suggests an unguligrade mode of locomotion rather than a plantigrade one."
Unguligrade literally means “hoof-step,” a fitting name for how horses carry themselves.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does unguligrade come from?
Unguligrade is a Latinate formation based on Latin ungula, meaning “hoof,” and gradus, meaning “step” or “pace,” so its literal sense is “moving on hooves.” In zoological usage, it became part of a terminology for classifying locomotion by the position of the foot and the portion of it that bears the body's weight. Its relatives ungulate, ungual, and unguis continue the same Latin family of words associated with hooves, nails, claws, and similar structures.
How unguligrade is actually used
This is a specialized zoological and anatomical term. It is not the ordinary word for a person walking quietly on tiptoe.
Easily confused with unguligrade
A plantigrade animal bears weight on the entire sole of the foot, including the heel, whereas an unguligrade animal bears weight on the terminal digits or hooves.
Digitigrade is the broader term for locomotion on the digits with the heel elevated, while unguligrade specifically emphasizes the hoofed terminal digits typical of ungulates.