Hēl'a-mȳs, n.

n. [Gr. ἐλλός, fawn, and μῦς, mouse.] (Zoöl.) A burrowing, rodent animal, of the genus Pedetes (P. capensis), found at the Cape of Good Hope, resembling in size and color a hare, but having a long tail;—called also jumping-rat or jumping-hare.