MATTE n.
A partly reduced copper sulphide, obtained by alternately roasting and melting copper ore in separating the metal from associated iron ores, and called coarse metal, fine metal, etc., according to the grade of fineness. On the exterior it is dark brown or black, but on a fresh surface is yellow or bronzy in color.…
MERCAPTAN n.
Any one of series of compounds, hydrosulphides of alcohol radicals, in composition resembling the alcohols, but containing sulphur in place of oxygen, and hence called also the sulphur alcohols. In general, they are colorless liquids having a strong, repulsive, garlic odor. The name is specifically applied to ethyl mer…
NEEDLE n.
ye-pointed needle instead of by a shuttle. -- Needle ore (Min.), acicular bismuth; a sulphide of bismuth, lead, and copper occuring in acicular crystals; -- called also aikinite. -- Needle shell (Zoöl.), a sea urchin. -- Needle spar (Min.), aragonite. -- Needle telegraph, a telegraph in which the signals are given…
OBSCURE v. 2 definitions
To render obscure; to darken; to make dim; to keep in the dark; to hide; to make less visible, intelligible, legible, glorious, beautiful, or illustrious. They are all couched in a pit hard by Herne's oak, with obscured lights. Shak. Why, 't is an office of discovery, love, And I should be obscured. Shak. There is scar…