FISSURE

v. crack; cleave; split; groove; divide, separate; be divided; be split; break open

n. narrow crack, narrow opening; natural cleft or groove (Anatomy)

In anatomy, fissure (Latin fissura, Plural fissurae) is a groove, natural division, deep furrow, cleft, or tear in various parts of the body.
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Fissure /fis·sure/ 1. any cleft or groove, normal or otherwise, especially a deep fold in the cerebral cortex involving its entire thickness. 2. [more]Fissure - Community and Resources

Noun
1. a long narrow depression in a surface
(synonym) crevice, cranny, crack, chap
(hypernym) depression, impression, imprint
2. a long narrow opening
(synonym) crack, cleft, crevice, scissure
(hypernym) opening, gap
(hyponym) chap
3. (anatomy) a long narrow slit or groove that divides an organ into lobes
(hypernym) groove, vallecula
(hyponym) sulcus
(classification) anatomy, general anatomy
Verb
1. break into fissures or fine cracks
(hypernym) crack
(derivation) crack, cleft, crevice, scissure

n. crack, fissure, split; crevice, rift, rip

adj. cracked, crannied

v. crack, fissure