### quadrant

Instrument used in navigation for measuring altitude, made up of a quarter-circle of wood or metal marked with a graded scale of angles. From the late 16thC quadrants made of brass, or brass and mahogany, with a pivoted radius, or index arm, came into use.

### quadrant

a device for measuring the height of stars in the sky which was used in the past for calculatingdirections when travelling across the sea

### quadrant

- a quarter of the circumference of a circle
- a quarter of the circumference of a circle
- any of the four areas into which a plane is divided by two orthogonal coordinate axes
- the area enclosed by two perpendicular radii of a circle
- a measuring instrument for measuring altitude of heavenly bodies

denotes one of four equal sections in the mouth. The upper right, upper left, lower right or the lower left.

Found on http://www.1stdentalcare.com/glossary.shtml

(from the article `Hadley, John`) In 1730, independently of Thomas Godfrey of Philadelphia, Hadley invented a quadrant (actually a double-reflecting octant) for measuring the ... The first instruments used at sea for elevation angle measurements seem to have been the quadrant and the astrolabe, long known to astronomers. For ... [2 ...

Found on http://www.britannica.com/eb/a-z/q/3

(from the article `McAuley, James Phillip`) ...at the University of Sydney, he taught for a while, served with Australian forces in World War II, and then became a senior lecturer at the ...

Found on http://www.britannica.com/eb/a-z/q/3

(kwod´rәnt) one fourth of the circumference of a circle. one of four corresponding parts, as of the abdominal surface, the dentition, the field of vision, or the tympanic membrane.

Found on http://www.encyclo.co.uk/local/21001

[

*n]* - a quarter of the circumference of a circle 2. [n] - a quarter of the circumference of a circle 3. [n] - any of the four areas into which a plane is divided by two orthogonal coordinate axes 4. [n] - the area enclosed by two perpendicular radii of a circle 5. [n] - a measuring instrument for measuring altitude of heavenl...

Found on http://www.webdictionary.co.uk/definition.php?query=quadrant

• (n.) The fourth part; the quarter. • (n.) The quarter of a circle, or of the circumference of a circle, an arc of 90

Found on http://thinkexist.com/dictionary/meaning/quadrant/

<dentistry> The four parts of your mouth, that is the upper left, the upper right, the lower left, and the lower right. ... (08 Jan 1998) ...

Found on http://www.encyclo.co.uk/local/20973

*noun* a quarter of the circumference of a circle

Found on http://wordnetweb.princeton.edu/perl/webwn?s=quadrant

*noun* a measuring instrument for measuring altitude of heavenly bodies

Found on http://wordnetweb.princeton.edu/perl/webwn?s=quadrant

*[architecture]* Quadrant in architecture refers to a curve in a wall or a vaulted ceiling. Generally considered to be an arc of 90 degrees - one quarter of a circle, or a half of the more commonly seen architectural feature - a crescent. The quadrant curve in architecture was a feature popularised by Palladio who used it often for the wings ...

Found on http://en.wikipedia.org/wiki/Quadrant_(architecture)

*[instrument]* A quadrant is an instrument that is used to measure angles up to 90°. It was originally proposed by Ptolemy as a better kind of astrolabe. Several different variations of the instrument were later produced by medieval Muslim astronomers. ==Types== There are several types of quadrants: They can also be classified as ==Geometric...

Found on http://en.wikipedia.org/wiki/Quadrant_(instrument)

*[plane geometry]* The axes of a two-dimensional Cartesian system divide the plane into four infinite regions, called quadrants, each bounded by two half-axes. These are often numbered from 1st to 4th and denoted by Roman numerals: I (where the signs of the two coordinates are (+,+)), II (−,+), III (−,−), and IV (+,−). When the axes a...

Found on http://en.wikipedia.org/wiki/Quadrant_(plane_geometry)

Quad'rant noun [ Latin quadrans , -antis , a fourth part, a fourth of a whole, from quattuor four: confer French quadrant , cadran . See Four , and confer Cadrans .] 1. The fourth part; the quarter. [ Obsolete] Sir T. Browne. 2.

Found on http://www.encyclo.co.uk/webster/Q/1

A navigation tool used to measure the altitude of the sun. Largely replaced by the back-staff.

Found on http://black-bart.co.uk/html/pirate_glossary.html

an instrument (later replaced by the sextant) used in navigating.

Found on https://www.cliffsnotes.com/literature/t/treasure-island/study-help/full-gl

Code name for the first Quebec conference (Churchill & Roosevelt)- August 1943

Found on http://www.secondworldwar.co.uk/glossq.html

Convex moulding of quarter circle profile, usually between fillets.

Found on http://www.crsbi.ac.uk/resources/glossary.html

denotes one of four equal sections in the mouth. The upper right, upper left, lower right or the lower left.

Found on http://www.cosmeticdentistryguide.co.uk/glossary.html

HMAS Quadrant was a British-built Australian Queensborough Class destroyer of 1705 tons displacement launched in 1942 and lent to the Royal Australian Navy in 1945. HMAS Quadrant was powered by two Admiralty 3-drum type boilers and carried a complement of 220. She was armed with four 4.7 inch guns; four 2 pdr guns; two 40 mm anti-aircraft guns; 20 ...

Found on http://www.probertencyclopaedia.com/browse/RQ.HTM

One of the four equal sections into which the dental arches can be divided; begins at the midline of the arch and extends distally to the last tooth.

Found on http://www.ada.org/glossaryforprofessionals.aspx

One of the four equal sections into which the dental arches can be divided; begins at the midline of the arch and extends backwards to the last tooth.

Found on http://www.dentistryforomaha.com/patient-info/dental-glossary/

One of the four equal sections of the mouth. the upper right, upper left, lower right or the lower left.

Found on http://www.thedentalclinic.com/glossary.html

**No exact match found**