fissure(redirected from presylvian fissure)
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Related to presylvian fissure: fissure of Sylvius
1. A long narrow opening; a crack or cleft.
2. The process of splitting or separating; division.
3. A separation into subgroups or factions; a schism.
4. Anatomy A normal groove or furrow, as in the liver or brain, that divides an organ into lobes or parts.
5. Medicine A break in the skin, usually where it joins a mucous membrane, producing a cracklike sore or ulcer.
intr. & tr.v. fis·sured, fis·sur·ing, fis·sures
To form a crack or cleft or cause a crack or cleft in.
[Middle English, cut, from Old French, from Latin fissūra, from fissus, split; see fissi-.]
1. any long narrow cleft or crack, esp in a rock
2. a weakness or flaw indicating impending disruption or discord: fissures in a decaying empire.
3. (Anatomy) anatomy a narrow split or groove that divides an organ such as the brain, lung, or liver into lobes. See also sulcus
4. (Medicine) a small unnatural crack in the skin or mucous membrane, as between the toes or at the anus
5. (Dentistry) a minute crack in the surface of a tooth, caused by imperfect joining of enamel during development
to crack or split apart
[C14: from medical Latin fissūra, from Latin fissus split]
n., v. -sured, -sur•ing. n.
1. a narrow opening produced by cleavage or separation of parts.
3. a natural division or groove in an anatomical organ, as in the brain.v.t.
4. to make fissures in; cleave; split.v.i.
5. to open in fissures; become split.
A long, narrow crack or opening in the face of a rock. Fissures are often filled with minerals of a different type from those in the surrounding rock.
Past participle: fissured
A split or groove.
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|Noun||1.||fissure - a long narrow depression in a surface|
|2.||fissure - a long narrow opening |
chap - a crack in a lip caused usually by cold
chink - a narrow opening as e.g. between planks in a wall
crevasse - a deep fissure
fatigue crack - a crack in metal resulting from metal fatigue
faulting, geological fault, fracture, break, fault, shift - (geology) a crack in the earth's crust resulting from the displacement of one side with respect to the other; "they built it right over a geological fault"; "he studied the faulting of the earth's crust"
opening, gap - an open or empty space in or between things; "there was a small opening between the trees"; "the explosion made a gap in the wall"
rift - a narrow fissure in rock
slit - a narrow fissure
split - a lengthwise crack in wood; "he inserted the wedge into a split in the log"
|3.||fissure - (anatomy) a long narrow slit or groove that divides an organ into lobes|
sulcus - (anatomy) any of the narrow grooves in an organ or tissue especially those that mark the convolutions on the surface of the brain
hilum, hilus - (anatomy) a depression or fissure where vessels or nerves or ducts enter a bodily organ; "the hilus of the kidney"
|Verb||1.||fissure - break into fissures or fine cracks|
crack - cause to become cracked; "heat and light cracked the back of the leather chair"
1. A usually narrow partial opening caused by splitting and rupture: