fissure | meaning of fissure in Longman Dictionary of Contemporary English | LDOCE

From Longman Dictionary of Contemporary Englishfissurefis‧sure /ˈfɪʃə $ -ər/ noun [countable]    HOLEa deep crack, especially in rock or earthExamples from the Corpusfissure• Even within Anglican evangelicalism fissures appeared.• Ahead lay a large fissure in the ice, three feet across.• They suggest heaven and earth are the product of a primal fissure.• This meant that the magma that fed the fissures of the second phase was almost completely de-gassed, hence its quiet emission.• About a million tons of lava are pouring every day from the fissure which opened on the Sicilian volcano in December.Origin fissure (1300-1400) French Latin; → FISSION