platinoid

American Heritage® Dictionary of the English Language, Fourth Edition

1. adj. Resembling platinum.
2. n. An alloy of copper, nickel, tungsten, and zinc, formerly used in electric coils.
3. n. A metal chemically resembling platinum, especially osmium, iridium, or palladium.

Century Dictionary and Cyclopedia

1. n. One of the metals with which platinum is invariably found associated. The platinoids are palladium, rhodium, iridium, osmium, and ruthenium.
2. n. An alloy, resembling German silver, composed of 60 parts copper, 14 parts nickel, 24 parts zinc and 1 to 2 parts tungsten. It has a greater resistance than German silver, and it is used largely in electrical work.

Wiktionary

1. adj. Of or resembling platinum
2. n. chemistry Any of several metals that resemble platinum in their chemistry; especially osmium, iridium and palladium
3. n. An alloy of copper, nickel, tungsten, and zinc once used in heating elements

GNU Webster's 1913

1. adj. Resembling platinum.
2. n. (Chem.) An alloy of German silver containing tungsten; -- used for forming electrical resistance coils and standards.