Definition of platinum black in English:

platinum black

Syllabification: plat·i·num black

noun

Platinum in the form of a finely divided black powder, used as a catalyst and absorbent for gases.
More example sentences
  • Soot, carbon black, platinum black, and carborundum are among the materials that come closest to a blackbody in the real world.

Definition of platinum black in:

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Word of the day apposite
Pronunciation: ˈapəzit
adjective
apt in the circumstances or relation to something