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A mineral of blackish lead-gray color and metallic luster, generally of a foliated massive structure; foliated tellurium. It is a telluride of lead and gold.

lizarin, obtained from naphthoquinone as a red crystalline substance with a bright green, metallic luster; -- called also naphthalizarin.

A compound of naphthalene or its radical with a metallic element; as, mercuric naphthide.

in; unregenerate. (c) Untamed; uncvilized. -- Nature printng, a process of printing from metallic or other plates which have received an impression, as by heavy pressure, of an object such as a leaf, lace, or the like. -- Nature worship, the worship of the personified powers of nature. -- To pay the debt of nature,…

Metalloidal; nonmetallic; -- contracted with positive or basic; as, the nitro group is negative.

A new metallic element, of doubtful genuineness and uncertain indentification, said to exist in certain minerals, as columbite. Hermann.

A mineral of a copper-red color and metallic luster; an arsenide of nickel; -- called also coppernickel, kupfernickel.

A bright silver-white metallic element. It is of the iron group, and is hard, malleable, and ductile. It occurs combined with sulphur in millerite, with arsenic in the mineral niccolite, and with arsenic and sulphur in nickel glance. Symbol Ni. Atomic weight 58.6.

A metallic alloy of a deep black color.

A binary compound of nitrogen with a more metallic element or radical; as, boric nitride.

A colorless nonmetallic element, tasteless and odorless, comprising four fifths of the atmosphere by volume. It is chemically very inert in the free state, and as such is incapable of supporting life (hence the name azote still used by French chemists); but it forms many important compounds, as ammonia, nitric acid, th…

ed in the sense of not; un-; in-; as in nonattention, or non-attention, nonconformity, nonmetallic, nonsuit.

Destitute of acid properties; hence, basic; metallic; positive; -- said of certain atoms and radicals.

A rare metallic element, of doubtful identification, said to occur in the copper-nickel of Norway.

A metallic oxide occurring in earthy form; as, tungstic ocher or tungstite.

A meteorite characterized by the presence of but a small amount of metallic iron.

A metallic substance, resembling gold in color, but inferior in value; a mixed metal of the ancients, resembling brass; -- called also aurichalcum, orichalcum, etc.

A rare metallic element of the platinum group, found native as an alloy in platinum ore, and in iridosmine. It is a hard, infusible, bluish or grayish white metal, and the heaviest substance known. Its tetroxide is used in histological experiments to stain tissues. Symbol Os. Atomic weight 191.1. Specific gravity 22.47…

A rare metallic element of the light platinum group, found native, and also alloyed with platinum and gold. It is a silver-white metal resembling platinum, and like it permanent and untarnished in the air, but is more easily fusible. It is unique in its power of occluding hydrogen, which it does to the extent of nearly…

A metallic disk, attached to a strap, and worn the palm of the hand, -- used to push the needle through the canvas, in sewing sails, etc.