niche

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niche

 [nich]
a small recess, depression or indentation, especially a recess in the wall of a hollow organ that tends to retain contrast media, as revealed by radiographs.

niche

(nitch, nēsh),
1. In contrast radiography, an eroded or ulcerated area, especially gastrointestinal or vascular, which can be detected when it fills with contrast medium.
2. An ecologic term for the position occupied by a species in a biotic community, particularly its relationships to various other competitor, predator, prey, and parasite species.
[Fr.]

niche

(nich) a defect in an otherwise even surface, especially a depression or recess in the wall of a hollow organ, as seen in a radiograph, or such a depression in an organ visible to the naked eye.
enamel niche  either of two depressions between the dental lamina and the developing tooth germ, one pointing distally (distal enamel n.) and the other mesially (mesial enamel n.) .

niche

[nich]
Etymology: Fr, recess
a defect in an otherwise even surface, especially a depression or recess in the wall of an organ as seen on a radiograph or by the unaided eye.

niche

Imaging A recess which may correspond to an ulcer in the wall of a hollow organ which tends to retain contrast medium

niche

(nich, nēsh)
1. radiography An eroded or ulcerated area, especially gastrointestinal or vascular, which can be detected when it fills with contrast medium.
2. An ecologic term for the position occupied by a species in a biotic community, particularly its relationships to various other competitor, predator, prey, and parasite species.
[Fr.]

niche

the sum of the characters that determine the position of an organism in its ECOSYSTEM. This includes all the chemical, physical, spatial and temporal factors required for the survival of that species and which limit its distribution and growth. A niche is characteristic of a SPECIES, and no two species occupy the same niche in the same environment in each others’ presence. However, a different species may occupy the same niche in the absence of the normal occupant from that habitat.

niche

a small recess, depression or indentation, especially a recess in the wall of a hollow organ that tends to retain contrast media, as revealed by radiography.

ecological niche
the geographical location in the physical environment which the particular organism occupies best, in which it thrives best. The boundaries are determined by the suitability of the climate and the feed provided and competition with predators and collaboration with synergists.
niche pericarditis
an abattoir finding in normal cattle; small red velvety patches on the outside of the great vessels.
References in periodicals archive ?
En juin et en juillet 1991 et 1992, on a etudie 89 parcelles de terrain (de 200 m sur 200) dans differents habitats pour y recenser les oiseaux de rivage en train d'y nicher.
La deuxieme categorie est celle des estivants, oiseaux venant au printemps afin de nicher et de se reproduire.
The nichers and the expanders are applying their capital with a strong strategic intent, and their capital is not idle.
By the end of Paul and Barnabas' first missionary journey a showdown between the ethnic nichers of Jerusalem and the international franchise network was coming to a head.
Granath also played a major role in the extension of the sports-only idea, spearheading the company's involvement in other nichers like Arts & Entertainment and Lifetime.
Sellers can expect nichers to be searching for program fodder at Mip.
owned nichers like Discovery and CNBC but also La Cinquieme, RTL, SBS and Planete.