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Fissure (Noun)

A long narrow opening.

Nouns denoting natural objects (not man-made).

A long narrow fissure in the wall allowed a sliver of light to enter the dark room.
The hikers had to maneuver carefully to avoid the deep fissure that split the mountain trail.
A subtle fissure in the windshield grew larger as the car continued to drive through the hail storm.
Scientists studied the fissure in the Earth's surface where tectonic plates were shifting apart.
The narrow fissure in the cave ceiling provided the perfect spot for the rock climber's rope.

(anatomy) a long narrow slit or groove that divides an organ into lobes.

Nouns denoting body parts.

The fissure of Rolando is a deep groove on the lateral surface of the brain's cerebral cortex that separates the frontal and parietal lobes.
Each lung has two fissures, a major one separating the upper and lower lobes and a minor one separating the middle lobe from the upper lobe.
The interventricular fissure in the heart is the groove between the two ventricles, formed by the muscles that meet in the cardiac apex.
The fissure of Sylvius or lateral fissure is a deep groove in the lateral surface of the brain that divides the temporal lobe from the frontal and parietal lobes.
The porta hepatis is a fissure on the underside of the liver where various vessels and bile ducts pass between the liver and the diaphragm.

A long narrow depression in a surface.

Nouns denoting two and three dimensional shapes.

The earthquake created a deep fissure in the ground that split the road in two.
A long fissure ran along the surface of the old, worn volcanic rock.
The canyon's walls featured a network of narrow fissures that provided shelter for wildlife.
Geologists studied the extensive fissure system in the lava flow to understand its formation.
The park's hiking trails had to be closed due to a new fissure that caused structural damage to the wooden bridge.