• WordNet 3.6
    • adj digitigrade (of mammals) walking on the toes with the posterior part of the foot raised (as cats, dogs, and horses do)
    • n digitigrade an animal that walks so that only the toes touch the ground as e.g. dogs and cats and horses
    • ***
Webster's Revised Unabridged Dictionary
    • n Digitigrade (Zoöl) An animal that walks on its toes, as the cat, lion, wolf, etc.; -- distinguished from a plantigrade, which walks on the palm of the foot.
    • a Digitigrade (Zoöl) Walking on the toes; -- distinguished from plantigrade.
    • ***
Century Dictionary and Cyclopedia
    • digitigrade Walking on the toes, with the heel raised from the ground; not stepping on the whole sole of the foot: applied chiefly to carnivorous quadrupeds, and opposed to plantigrade, but without special reference to the Digitigrada as framed by Cuvier. Most quadrupeds are digitigrade. Specifically
    • digitigrade Of or pertaining to the Digitigrada; having the characters of the Digitigrada.
    • n digitigrade One of the Digitigrada.
    • ***
Chambers's Twentieth Century Dictionary
    • Digitigrade walking on the toes
    • ***


Webster's Revised Unabridged Dictionary
L. digitus, finger, toe + gradi, to step, walk: cf. F. digitigrade,
Chambers's Twentieth Century Dictionary
L. digitus, a finger or toe, akin to Gr. daktylos.


In literature:

The much persecuted otter presents himself to our notice among the worm-bodied, digitigrade animals.
"Anecdotes of the Habits and Instinct of Animals" by R. Lee
For the majority of mammals are what has been called digitigrade.
"Darwin, and After Darwin (Vol. 1 and 3, of 3)" by George John Romanes
Limbs of moderate length, and partially digitigrade in walking.
"Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 4" by Various
Is the cat digitigrade or plantigrade?
"A Guide for the Study of Animals" by Worrallo Whitney
These are the digitigrades.
"Artistic Anatomy of Animals" by Édouard Cuyer
The fore- as well as the hind-feet are in a state of transition between plantigradism and digitigradism.
"The Cambridge Natural History, Vol X., Mammalia" by Frank Evers Beddard