platinoid

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Resembling platinum.
• noun An alloy of copper, nickel, tungsten, and zinc, formerly used in electric coils.
• noun A metal chemically resembling platinum, especially osmium, iridium, or palladium.

from The Century Dictionary.

• noun 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.
• noun One of the metals with which platinum is invariably found associated. The platinoids are palladium, rhodium, iridium, osmium, and ruthenium.

from the GNU version of the Collaborative International Dictionary of English.

• adjective Resembling platinum.
• noun (Chem.) An alloy of German silver containing tungsten; -- used for forming electrical resistance coils and standards.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective Of or resembling platinum
• noun chemistry Any of several metals that resemble platinum in their chemistry; especially osmium, iridium and palladium
• noun An alloy of copper, nickel, tungsten, and zinc once used in heating elements