fissure

fissure is a topic covered in the Taber's Medical Dictionary.

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(fish′ŭr)

[ fissura, cleft]

1. A groove, natural division, cleft, slit, or deep furrow in the brain, liver, spinal cord, and other organs.
SYN: SEE: fissura; SEE: sulcus
2. An ulcer or cracklike sore.
3. A break in the enamel of a tooth.
fissural (fish′ŭ-răl), adj.

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