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fissure (n.)

c. 1400, from Old French fissure (13c.) and directly from Latin fissura "a cleft," from root of findere "to split, cleave, separate, divide," from PIE *bhind-, nasalized form of root *bheid- "to split."

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Definitions of fissure from WordNet
1
fissure (n.)
a long narrow depression in a surface;
Synonyms: crevice / cranny / crack / chap
fissure (n.)
a long narrow opening;
Synonyms: crack / cleft / crevice / scissure
fissure (n.)
(anatomy) a long narrow slit or groove that divides an organ into lobes;
2
fissure (v.)
break into fissures or fine cracks;
From wordnet.princeton.edu