Triassic has 4 different meanings across 3 categories:
Noun · Adjective · Proper Noun
from 230 million to 190 million years ago; dinosaurs, marine reptiles; volcanic activity
of or relating to or denoting the first period of the Mesozoic era
Of or from the geologic strata above the Permian and below the Jurassic; of or belonging to the period 250 to 200 million years ago when these strata were laid down.
A geologic period within the Mesozoic era, comprising lower, middle and upper epochs from about 250 to 200 million years ago.