A cleft or groove. A fissure can be normal or abnormal. A fissure in the cerebral cortex is a normal feature. It is a deep fold that involves the entire thickness of the brain wall. A fissure in the anus is abnormal. It is a painful crack in the edge of the anus and is very painful. Also called an anal fissure or fissure in ano.

The opening for the eye between the eyelids.

Opening or crack in the Earth's crust.

a long narrow depression in a surface The brown bark is not very rough, though its numerous fissures and cracks give it a rugged appearance. — Step, Edward

A groove or tear.

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 *bhi-n-d-, from root *bheid- [..]

a particularly deep sulcus

An extensive crack, break, or fracture in the rocks.

narrow opening or crack.

n. A crack or crack-like depression.

a crack in the crust through which lava may erupt.

A groove or natural division, deep furrow in the brain.

(fish´ur) A groove or narrow cleft that separates two parts, such as the cerebral hemispheres of the brain. flagellum

the name that is given to a groove, cleft or indentation that appears in a surface, in particular the cerebral cortex that increases the brains surface area. See sulcus.

groove (pop)

Longitudinal crack through only one surface of a bone.

elongated fracture or crack on a volcano. Fissures can host eruptions, which typically consist of lava flows or lava fountains, and can be kilometres long

(n) a long narrow depression in a surface(n) a long narrow opening(n) (anatomy) a long narrow slit or groove that divides an organ into lobes(v) break into fissures or fine cracks

  A long and narrow opening made by cracking, splitting or separation of parts

An extensive crack, break, or fracture in the rocks.

Elongate, narrow fractures. flaggy

A cleft or groove, normal or otherwise. When one occurs in the pars interarticularis, the yoke of bone connecting the right and left facets, the condition is known as spondylolysis. When discs become [..]

Longitudinal crack through only one surface of a bone.

Elongate, narrow fractures.

A hairline opening in the face of stone demonstrating stones natural characteristics; a lineal or non-directional void in the face and crystalline structure of stone that typically is very thin and ir [..]

A narrow crack or cleft, as in a rock face.

An extensional crack, break, or fracture in the rocks.

Deep grooves or clefts in the surface of Teeth equivalent to class 1 cavities in Black's Classification of Dental Caries.

Crack extending far into a planet or moon through which magma travels to and erupts onto the surface.

A fissure is a surface-reaching fracture. The term fracture is sometimes used interchangeably.

An extensive crack, break or fracture in rocks. Fixed Assets

A deep furrow, cleft, or slit in the epidermis that is often treated by a dermatologists.

a crack in a rock surface through which lava flows