cobalt

plural cobalts

1. uncountableusuallyA chemical element (symbol Co) with an atomic number of 27: a hard, lustrous, silver-gray metal.
2. uncountableusuallyCobalt blue.

   1 more example

   And although we’ve certainly seen a variety of blue shades — from periwinkle to cobalt and even Dean Cain’s indigo-washed costume from the 1990’s TV show “Lois & Clark” — Superman’s uniform is still instantly recognizable across generations. In fact, there is only one film — Zack Snyder’s 2013 “Man of Steel” — in which Superman does not wear his iconic red belted trunks.

   2025 February 21, Leah Dolan, “How the Superman ‘S’ became fashion’s favorite logo”, in CNN

1. A place in the United States:
   1. A community in the town of East Hampton, Middlesex County, Connecticut.
   2. An unincorporated community in Lemhi County, Idaho.
   3. A village in Madison County, Missouri.
2. A town in Timiskaming District, Ontario, Canada.