Chasma in English dictionary chasma Meanings and definitions of "Chasma" (astronomy, geology) A long, narrow, steep-sided depression on a planet (other than Earth), a moon, or another body in the solar system. noun (astronomy, geology) A long, narrow, steep-sided depression on a planet (other than Earth), a moon, or another body in the solar system. noun (astronomy, obsolete, rare) An aurora. more Grammar and declension of Chasma chasma ( plural chasmata) chasma (plural chasmata) more Chasma Images with "Chasma" Sample sentences with "Chasma" Declension Stem Try again Available translations Catalan Dutch Estonian French Galician German Indonesian Italian Japanese Luxembourgish Macedonian Norwegian Portuguese Russian Spanish Authors