kt -abbr

  1. karat
  2. knight
  3. knot

KT -abbr

  1. kiloton
  2. of, relating to, or occurring at the K-T boundary
    • KT extinctions

KT boundary -n

  1. the transition between the Cretaceous and Tertiary periods of geologic time characterized by a mass extinction of many forms of life including the dinosaurs
  2. a geologic stratum marking this boundary