ultracooled

English

Etymology

From ultra- +‎ cooled.

Adjective

ultracooled (not comparable)

1. Cooled to a very low temperature.
   • 2007 February 8, Kenneth Chang, “Wizardry at Harvard: Physicists Move Light”, in New York Times‎:

     In 1999, Dr. Hau headed a team of scientists that slowed light, which travels a brisk 186,282 miles a second when unimpeded, to a leisurely 38 miles an hour by shining it into an exotic, ultracooled cloud of sodium atoms.