platinoid, a. and n.
(ˈplætɪnɔɪd)
[f. platin-um + -oid.]
A. adj. Resembling platinum.
| 1864 in Webster. 1886 in Cassell's Encycl. Dict. |
B. n. [Cf. metalloid.]
1. Chem. Any metal of the class comprising platinum and those commonly found in association with it and resembling it in several properties, viz. iridium, osmium, palladium, rhodium, and ruthenium. Also called platinum metals.
| 1882 in Ogilvie. |
2. Name for an alloy of nickel, zinc, copper, and tungsten, of a silvery white colour, and resembling platinum in non-liability to tarnish, etc.
| 1885 Engineering 3 July 17 Platinoid is practically German silver with from 1 to 2 per cent. of tungsten in it. 1892 Pall Mall G. 21 Mar. 3/1 Very fine wires of ‘platinoid’, or some other convenient alloy. |