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 ?
Inter second premolar width: Measurements were made between the buccal cusp tips of right and left second premolars.
So, P function for posterior arch width of subject can be calculated using orthometer data and spatial positions of distobuccal cusp tips of the first molars (yellow curve in Fig.
The following reference points and planes on lateral cephalograms were used: L1, the incisal tip of the mandibular central incisor; M7, the distobuccal cusp tip of the mandibular permanent second molar; mandibular plane (MP), the line between gonion and gnathion; L1-MP, the perpendicular distance from the tip of L1 to the mandibular plane; M7-MP, the perpendicular distance from the distobuccal cusp tip of M7 to the mandibular plane; and S-MP, the perpendicular distance from the deepest point of the VSC to the mandibular plane.
Bishara et al14 used the average of the sum of the perpendicular distances to each cusp tip. Sondhi et al15 used the sum of the perpendiculars.
On lateral cephalograms, perpendicular distances from the incisal tip of mandibular central incisor (L1-MP), the deepest point of COS (S-MP) and distobuccal cusp tip of mandibular second molar (L7-MP) to mandibualr plane (MP) were measured and proportioned as L1-MP/S-MP and L7-MP/S-MP.
--The mesiodistal extension of the cavity on mesial and distal boxes of all prepared teeth was up to 1 mm to adjacent cusp tips (Fig.
The depth of the Curve of Spee was measured on lateral cephalograms as perpendicular distance from incisal tip of the mandibular central incisor to the mandibular plane (L1-MP), distobuccal cusp tip of the mandibular second molar (M7-MP) to the mandibular plane, the deepest point of the Curve of Spee to the mandibular plane (S-MP), and proportioned with each other.
Maxillary Interpremolar width (UP-P): Distance be- tween buccal cusp tips of right and left maxillary first premolars.
Mandibular Intermolar width (LM-M): Distance between the mesiobuccal cusp tips of right and left mandibular permanent first molars.
2 Mandibular Interpremolar width (LP-P): Distance between buccal cusp tips of right and left mandibular permanent first premolars.
The vernier caliper was used to measure the distance between the mesiobuccal cusp tips of mandibular first molars.
* Intercanine width (ICW) The distance between cusp tips of cuspids.