K–T boundary

noun

Definition of K–T boundary

  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; also :  a geologic stratum marking this boundary

Origin and Etymology of k–t boundary

K (alternative for C as abbreviation for Cretaceous) + Tertiary


First Known Use: 1983


Seen and Heard

What made you want to look up K–T boundary? Please tell us where you read or heard it (including the quote, if possible).

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

WORD OF THE DAY

to link together in a series or chain

Get Word of the Day daily email!

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!