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t is used for making cameos, the figure being cut in one layer with the next as a ground. Onyx marble, a banded variety of marble or calcium carbonate resembling onyx. It is obtained from Mexico.

An onyx, part or all of whose layers consist of jasper.

The operation of removing a cataract by thrusting a needle through the cornea of the eye, and breaking up the opaque mass.

An extinct quaternary mammal, of great size, allied to the sloth.

A variety of onyx consisting of sard and white chalcedony in alternate layers.

A genus of fresh-water or river turtles which have the shell imperfectly developed and covered with a soft leathery skin. They are noted for their agility and rapacity. Called also soft tortoise, soft-shell tortoise, and mud turtle.

A badgerlike animal of India (Arcionyx collaris).

An American singing bird (Dolichonyx oryzivorus). The male is black and white; the female is brown; -- called also, ricebird, reedbird, and Boblincoln. The happiest bird of our spring is the bobolink. W. Irving.

ring for the back and breast, held together on the shoulders by two clasps or brooches of onyx stones set in gold, and fastened by a girdle of the same stuff as the ephod. The ephod for the priests was of plain linen; that for the high priest was richly embroidered in colors. The breastplate of the high priest was worn…

ve or cut, as letters or figures, on some hard substance; to engrave. Thou shalt take two onyx stones, and grave on them the names of the children of Israel. Ex. xxviii. 9.

mily of extinct edentates found in America. The family includes the megatherium, the megalonyx, etc.

l. (b) A gallinule, esp. the European species. See Gallinule. (c) An Australian rail (Tribonyx ventralis). -- Moor monkey (Zoöl.), the black macaque of Borneo (Macacus maurus). -- Moor titling (Zoöl.), the European stonechat (Pratinocola rubicola).

l.) Same as Tasmanian devil, under Devil. -- Native hen (Zoöl.), an Australian rail (Tribonyx Mortierii). -- Native pheasant. (Zoöl.) See Leipoa. -- Native rabbit (Zoöl.), an Australian marsupial (Perameles lagotis) resembling a rabbit in size and form. -- Native sloth (Zoöl.), the koala. -- Native thrush (Zoöl.),…

The precious stone called onyx. [R.]

(Potamites, or Trionychoidea) having a soft shell, webbed feet, and a sharp beak. See Trionyx.

one of numerous fresh-water tortoises inhabiting rivers, especially those of the genus Trionyx and allied genera. See Trionyx.

Any one of several species of spotted seals, especially Ogmorhinus leptonyx, and Leptonychotes Weddelli, of the Antarctic Ocean. The North Pacific sea leopard is the harbor seal.

m hard-tack, or ship bread. -- Soft tortoise (Zoöl.), any river tortoise of the genus Trionyx. See Trionyx.

toise. (Zoöl.) See Painted turtle, under Painted. -- Soft-shell tortoise. (Zoöl.) See Trionyx. -- Spotted tortoise. (Zoöl.) A small American fresh-water tortoise (Chelopus, or Nanemys, quttatus) having a blackish carapace on which are scattered round yellow spots. -- Tortoise beetle (Zoöl.), any one of numerous spec…

A division of chelonians which comprises Trionyx and allied genera; -- called also Trionychoides, and Trionychina.