Noun missippian period has 1 sense
  1. Mississippian, Missippian period, Lower Carboniferous, Lower Carboniferous period - from 345 million to 310 million years ago; increase of land areas; primitive ammonites; winged insects
    --1 is a kind of period, geological period
    --1 is a part of Carboniferous, Carboniferous period
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