niche

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niche:

see ecologyecology,
study of the relationships of organisms to their physical environment and to one another. The study of an individual organism or a single species is termed autecology; the study of groups of organisms is called synecology.
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Niche

A recess in a wall; usually semicircular at the back, terminating in a half-dome, or with small pediments supported on consoles, often used as a place for a statue.

angle niche

A niche formed at a corner of a building; common in medieval architecture.

Niche

 

(1) In architecture, a recess in a wall for a statue, a vase, built-in shelves, and similar objects. Niches are sometimes used to impart a sculptural quality to a wall.

(2) In geomorphology, a niche, or crater, is a cavity in the lower part of a protruding abrasion shoreline. It occurs as a result of wave erosion. As the niche becomes deeper, the weight of the bench of bedrock hanging over it increases. The bench finally breaks off and a cliff, an overhanging scarp, forms.

(3) In military science, a niche is a recess in the wall of a trench or communications passage. It is used to store ammunition and water and serves as protection from bullets, shell fragments, and mortar fire. It is also a shelter during bad weather. In loose soils, the walls and ceiling of the niche are faced with boards or any available material.

niche

[nich]
(ecology)
The unique role or way of life of a plant or animal species.
(geology)
A shallow cave or reentrant produced by weathering and erosion near the base of a rock face or cliff or beneath a waterfall.

niche

A recess in a wall, usually to contain sculpture or an urn; often semicircular in plan, surmounted by a half dome.

niche

1. a recess in a wall, esp one that contains a statue
2. any similar recess, such as one in a rock face
3. Commerce relating to or aimed at a small specialized group or market
4. Ecology the role of a plant or animal within its community and habitat, which determines its activities, relationships with other organisms, etc.