YT -abbr

  1. Yukon Territory

yt·ter·bi·um [i-'tər-bē-əm] -n

  1. a soft metallic element of the rare-earth group that occurs esp. with other rare earth elements in minerals and that has few commercial uses

yt·tri·um ['i-trē-əm] -n

  1. a metallic element usu. included in the rare-earth group that occurs usu. with other rare earth elements in minerals and is used esp. in phosphors, YAG lasers, and superalloys