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Tri·as·sic
 Triassic
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- pronunciation:
- traI
ae
sihk
- parts of speech:
- adjective, noun
| part of speech: |
adjective |
| definition: |
of, relating to, or designating the first geological period of the Mesozoic Era, from approximately 220 million to 180 million years ago, when volcanic activity was prominent and many reptiles, including the dinosaurs, appeared.
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| part of speech: |
noun |
| definition: |
the Triassic Period, or the rock formations that date from that time.
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