antimony

noun

Etymology: From Medieval Latin antimonium, attested in the 11th century; see also the Wikipedia section.

1. A chemical element (symbol Sb, from Latin stibium) with an atomic number of 51: in its stable allotrope, a lustrous gray and very brittle metal.

   “Deep in the Salmon River Mountains, an Idaho mining company, Perpetua Resources, is proposing a vast open-pit gold mine that would also produce 115 million pounds of antimony — an element that may be critical to manufacturing the high-capacity liquid-metal batteries of the future.”

2. The alloy stibnite.

   “In quality synergistic additives in a composition use oxide antimonies.”