МЕЛОВАЯ СИСТЕМА noun
Меловая система меловой период
Synset
Interlingual Index
[Wordnet definition: from 135 million to 63 million years ago; end of the age of reptiles; appearance of modern insects and flowering plants]
hypernym
[RuThes concept: геологический период]
domain
part holonym
POS-synonymy
[RuThes concept: меловой период]