[ケイーティーきょうかい(Ｋ−Ｔ境界);ケイティーきょうかい(ＫＴ境界), kei-tei-kyoukai ( K-T kyoukai ); keitei-kyoukai ( KT kyoukai )] (n) K-T boundary (between the Cretaceous Period and the Tertiary Period) [Add to Longdo]
Result from Foreign Dictionaries (2 entries found)
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Cretaceous \Cre*ta"ceous\ (kr[-e]*t[=a]"sh[u^]s), a. [L.
cretaceus, fr. creta chalk. See {Crayon}.]
1. Having the qualities of chalk; abounding with chalk;
chalky; as, cretaceous rocks and formations. See {Chalk}.
[1913 Webster]
2. (Geol.) Of, pertaining to, or designating, the period of
time following the Jurassic and preceding the Tertiary,
generally given as from 144 million years b. p. to 65
million years b. p.. Also called
From WordNet (r) 3.0 (2006) [wn]:
cretaceous
adj 1: abounding in chalk
2: of or relating to or denoting the third period of the
Mesozoic era
n 1: from 135 million to 63 million years ago; end of the age of
reptiles; appearance of modern insects and flowering plants
[syn: {Cretaceous}, {Cretaceous period}]
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