cusp

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cusp

1. Dentistry any of the small elevations on the grinding or chewing surface of a tooth
2. Anatomy any of the triangular flaps of a heart valve
3. Geometry a point at which two arcs of a curve intersect and at which the two tangents are coincident
4. Architect a carving at the meeting place of two arcs
5. Astronomy either of the points of a crescent moon or of a satellite or inferior planet in a similar phase
6. Astrology any division between houses or signs of the zodiac

cusp

Either of the tapering points of the crescent phase of the Moon, Venus, or Mercury.

Cusp

The intersection of two arcs or foliations in a tracery; the figure formed by the intersection of tracery arcs or foliations.

Cusp

(religion, spiritualism, and occult)

In astrology, cusp refers to two different but related divisions. First, a cusp is the dividing line separating a sign from its preceding sign. For example, someone born just prior to the Sun’s movement out of Cancer and into Leo is said to be “on the cusp of Leo” or “on the Cancer-Leo cusp.” Such an individual is said to manifest traits of both signs.

Second, the cusp is the dividing line separating a house from the preceding house. For example, if an individual’s seventh house begins at 10° Aries and ends at 13° Taurus, the person’s seventh house cusp is at 10° Aries. Planets located at end of one house so that they are very close (usually within 5°) to the next house are said to influence the affairs of both houses. Thus, to continue using the previous example, a natal Venus located at 8° Aries in the sixth house would exert—over and above its influence in the sixth house—an influence in the seventh house because it is only 2° away from the seventh-house cusp.

Sources:

Brau, Jean-Louis, Helen Weaver, and Allan Edmands. Larousse Encyclopedia of Astrology. New York: New American Library, 1980.
Leo, Alan. The Complete Dictionary of Astrology. Rochester, VT: Destiny Books, 1989.

cusp

[kəsp]
(anatomy)
A pointed or rounded projection on the masticating surface of a tooth.
One of the flaps of a heart valve.
(architecture)
A pointed projection or peak created by the intersection of two arcs.
(geology)
One of a series of low, crescent-shaped mounds of beach material separated by smoothly curved, shallow troughs spaced at more or less regular intervals along and generally perpendicular to the beach face. Also known as beach cusp.
(geophysics)
Any of the funnel-shaped regions in the magnetosphere extending from the front magnetopause to the polar ionosphere, and filled with solar wind plasma.
(mathematics)
A singular point of a curve at which the limits of the tangents of the portions of the curve on either side of the point coincide. Also known as spinode.

cusp

types of cusps
1. The intersection of two arcs or foliations in a tracery.
2. The figure formed by the intersection of tracery arcs. Also see foil.
References in periodicals archive ?
Occurrence of a talon cusp on the labial surface and double labial talon cusps is rare and uncommon (13).
Histomorphometric examination has revealed that the talon cusp has normal enamel and dentin with a substantially enlarged pulp tissue, which suggests that talon tooth, may be a developmental anomaly originating in the stage of morphodifferentiation (10).
Talon cusps, macrodontia, and aberrant tooth morphology in Berardinelli-Seip syndrome.
Root abnormalities, talon cusps, dens invaginati with reduced alveolar bones levels: case report.
Measurements of the talon tooth were compared with those of the regular teeth, as well as between the talon cusp and the three other sides of the affected teeth.
Treatment of a talon cusp involves clinical judgment and is dependent upon the size of the talon cusp.
The precise aetiology of talon cusp is not wellknown, but it is suggested that a combination of genetic and environmental factors may play a vital role in its formation.
Radiographically, a talon cusp appears similar to that of a normal tooth, presenting with radiopaque enamel and dentin with or without extension of pulpal tissues.
Tooth agenesis, supernumerary teeth, molar incisor hypomineralisation (MIH) and talon cusps are conditions that may present a major challenge for the child patient and complex treatment challenges for the dental practitioner.
Talon cusps were found only in 30 patients with a prevalence of 0.
The complications of talon cusp are diagnostic, functional aesthetic and pathological "A large talon cusp is unaesthetic and presents clinical problems.
Key words: Talon cusps, Dens invaginatus, Short roots, Microdontia, Dilacerations, Cross bite