What does the word fissure mean?

Usage examples for fissure

  1. Apparently we were on the brink of a crater, but the thick fumes of the disagreeable vapor made it impossible for us to guess at the breadth of the fissure. – The Former Philippines thru Foreign Eyes by Tom├ís de Comyn Fedor Jagor Rudolf Ludwig Carl Virchow Charles Wilkes
  2. It was cool and quiet in there when Jack discovered the hiding place, and the wind blowing directly from the south that day, did not more than whistle pleasantly through a big fissure somewhere in the roof. – The Lookout Man by B. M. Bower
  3. It was no ragged crevice, no nature split fissure; it gave the impression of a gigantic doorway. – The Metal Monster by A. Merritt

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