Chasma Definition
    noun
  
 (astronomy, geology) A long, narrow, steep-sided depression on a planet (other than Earth), a moon, or another body in the solar system.
Wiktionary 
Other Word Forms of Chasma
Noun
Singular:
 chasmaPlural:
 chasmataOrigin of Chasma
- From Ancient Greek χάσμα (khasma). - From Wiktionary 
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