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

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