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An extinct genus of Tertiary mammals allied to the horse, but three-toed, having on each foot a small lateral hoof on each side of the main central one. It is believed to be one of the ancestral genera of the Horse family.

bious, herbivorous mammal (Hippopotamus amphibius), common in the rivers of Africa. It is allied to the hogs, and has a very thick, naked skin, a thick and square head, a very large muzzle, small eyes and ears, thick and heavy body, and short legs. It is supposed to be the behemoth of the Bible. Called also zeekoe, and…

An eruptive disease (Varicella globularis), allied to the chicken pox.

A quadruped of the genus Sus, and allied genera of Suidæ; esp., the domesticated varieties of S. scrofa, kept for their fat and meat, called, respectively, lard and pork; swine; porker; specifically, a castrated boar; a barrow.

also hoop, whoop. The name is also applied to several other species of the same genus and allied genera.

s to hop vines. -- Hop froth fly (Zoöl.), an hemipterous insect (Aphrophora interrupta), allied to the cockoo spits. It often does great damage to hop vines. -- Hop hornbeam (Bot.), an American tree of the genus Ostrya (O.Virginica) the American ironwood; also, a European species (O. vulgaris). -- Hop moth (Zoöl.),…

-- Horn mercury. (Min.) Same as Horn quicksilver (below). -- Horn poppy (Bot.), a plant allied to the poppy (Glaucium luteum), found on the sandy shores of Great Britain and Virginia; -- called also horned poppy. Gray. -- Horn pox (Med.), abortive smallpox with an eruption like that of chicken pox. -- Horn quicksil…

and has similar habits. Hornet fly (Zoöl.), any dipterous insect of the genus Asilus, and allied genera, of which there are numerous species. They are large and fierce flies which capture bees and other insects, often larger than themselves, and suck their blood. Called also hawk fly, robber fly. -- To stir up a horne…

Any one of family (Uroceridæ) of large hyminopterous insects, allied to the sawflies. The larvæ bore in the wood of trees. So called from the long, stout ovipositors of the females.

A plant of the genus Nasturtium (N. Armoracia), allied to scurvy grass, having a root of a pungent taste, much used, when grated, as a condiment and in medicine. Gray. Horse-radish tree. (Bot.) See Moringa.

A leafless plant, with hollow and rushlike stems. It is of the genus Equisetum, and is allied to the ferns. See Illust. of Equisetum.

Any species or marine hydroids, of the genus Hydractinia and allied genera. These hydroids form, by their rootstalks, a firm, chitinous coating on shells and stones, and esp. on spiral shells occupied by hermit crabs. See Illust. of Athecata.

Any sea snake of the genus Hydrophys and allied genera. These snakes are venomous, live upon fishes, and have a flattened tail for swimming.

Like, or allied to, the porcupines; -- said of a group (Hystricomorpha) of rodents.

Any bird of the genus Ibis and several allied genera, of the family Ibidæ, inhabiting both the Old World and the New. Numerous species are known. They are large, wading birds, having a long, curved beak, and feed largely on reptiles.

The language of the Icelanders. It is one of the Scandinavian group, and is more nearly allied to the Old Norse than any other language now spoken.

An extinct order of marine reptiles, including Ichthyosaurus and allied forms; -- called also Ichthyopterygia. They have not been found later than the Cretaceous period.

Pertaining to, or derived from, the holly (Ilex), and allied plants; as, ilicic acid.

Any bird of the genus Indicator and allied genera. See Honey guide, under Honey.

An extinct genus of large, fossil, bivalve shells,allied to the mussels. The genus is characteristic of the Cretaceous period.