Platinum Definition

plătn-əm

noun

A silver-colored, malleable, ductile, metallic chemical element that is highly resistant to corrosion and tarnish, used as a chemical catalyst, for acid-proof containers, ignition fuses, jewelry, dental alloys, etc.: symbol, Pt; at. no. 78

Webster's New World

A medium to light gray.

American Heritage

A trademark for a certification indicating that a recording, such as an album of music, has sold a million copies.

American Heritage

A whitish grey colour, like that of the metal.

Wiktionary

Synonyms:

Synonyms:
atomic number 78
pt

adjective

Designating a record, tape, disc, video, etc. which has registered sales of a specified number, as two million, or value, as $1,000,000

Webster's New World

Of a whitish grey colour, like that of the metal.

Wiktionary

Other Word Forms of Platinum

Noun

Singular:

platinum

Plural:

platinums

Origin of Platinum

Spanish platina (“little silver"), because platinum was found as an apparent impurity with silver.

From Wiktionary
New Latin from Spanish platina platinum platina

From American Heritage Dictionary of the English Language, 5th Edition