noun
a unit of geological time during which a system of rocks formed
-
ganoid fishes swarmed during the earlier geological periods
• Syn: ↑period
• Hypernyms: ↑geological time, ↑geologic time
• Hyponyms: ↑ice age, ↑glacial period, ↑glacial epoch
• Instance Hyponyms:
↑Quaternary, ↑Quaternary period, ↑Age of Man, ↑Tertiary, ↑Tertiary period, ↑Cretaceous, ↑Cretaceous period, ↑Jurassic, ↑Jurassic period, ↑Triassic, ↑Triassic period, ↑Permian, ↑Permian period, ↑Carboniferous, ↑Carboniferous period, ↑Pennsylvanian, ↑Pennsylvanian period, ↑Upper Carboniferous, ↑Upper Carboniferous period, ↑Mississippian, ↑Missippian period, ↑Lower Carboniferous, ↑Lower Carboniferous period, ↑Devonian, ↑Devonian period, ↑Age of Fishes, ↑Silurian, ↑Silurian period, ↑Ordovician, ↑Ordovician period, ↑Cambrian, ↑Cambrian period
• Part Holonyms: ↑era, ↑geological era
• Part Meronyms: ↑epoch
Useful english dictionary. 2012.