OR conj.
A particle that marks an alternative; as, you may read or may write, -- that is, you may do one of the things at your pleasure, but not both. It corresponds to either. You may ride either to London or to Windsor. It often connects a series of words or propositions, presenting a choice of either; as, he may study law, o…
ORANGE n.
of shrubs of the genus Philadelphus, which have whitish and often fragrant blossoms. -- Native orange, or Orange thorn (Bot.), an Australian shrub (Citriobatus parviflorus); also, its edible yellow berries. -- Orange bird (Zoöl.), a tanager of Jamaica (Tanagra zena); -- so called from its bright orange breast. -- O…
ORE n. 2 definitions
The native form of a metal, whether free and uncombined, as gold, copper, etc., or combined, as iron, lead, etc. Usually the ores contain the metals combined with oxygen, sulphur, arsenic, etc. (called mineralizers).
OSMIUM n.
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…
PALLADIUM n.
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…