K-T boundary
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About Our Definitions: All forms of a word (noun, verb, etc.) are now displayed on one page.K–T boundary
nounDefinition of K-T BOUNDARY
: 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
See Origin of K-T BOUNDARY
K (alternative for C as abbreviation for Cretaceous) + Tertiary
First Known Use: 1983
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