castor

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castor:

see beaverbeaver,
either of two large aquatic rodents, Castor fiber and Castor canadensis, known for their engineering feats. They were once widespread in N and central Eurasia except E Siberia, and in North America from the arctic tree line to the S United States.
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.

Castor

(kăs`tər), bright star in the constellation GeminiGemini
[Lat.,=the twins], northern constellation lying on the ecliptic (the sun's apparent path through the heavens) between Taurus and Cancer, N of Canis Minor; it is one of the constellations of the zodiac. Gemini is traditionally depicted as two men.
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; Bayer designation α Geminorum; 1992 position R.A. 7h34.1m, Dec. +31°54'. Slightly dimmer than PolluxPollux,
brightest star in the constellation Gemini; Bayer designation Beta Geminorum; 1992 position R.A. 7h44.8m, Dec. +28°03'. An orange giant of spectral class K0 III, it is the nearest giant star, lying at a distance of 35 light-years.
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, with which it forms the Twins, Castor has an apparent magnitudemagnitude,
in astronomy, measure of the brightness of a star or other celestial object. The stars cataloged by Ptolemy (2d cent. A.D.), all visible with the unaided eye, were ranked on a brightness scale such that the brightest stars were of 1st magnitude and the dimmest stars
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 of 1.58, which still makes it one of the 25 brightest stars in the sky. Castor is actually a six-star system, being a visual triple each component of which is a binary starbinary star
or binary system,
pair of stars that are held together by their mutual gravitational attraction and revolve about their common center of mass. In 1650 Riccioli made the first binary system discovery, that of the middle star in the Big Dipper's handle, Zeta
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; the three components are an eclipsing binary and a pair of spectroscopic binaries. The two brightest components are white, main-sequence stars of spectral classesspectral class,
in astronomy, a classification of the stars by their spectrum and luminosity. In 1885, E. C. Pickering began the first extensive attempt to classify the stars spectroscopically.
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 A1 and A5. The system is about 50 light-years distant.
The Columbia Electronic Encyclopedia™ Copyright © 2013, Columbia University Press. Licensed from Columbia University Press. All rights reserved. www.cc.columbia.edu/cu/cup/

Castor

(kass -ter, kahss -) (α Gem) A white star that is the second-brightest in the constellation Gemini. It is a visual triple star, the two brighter components having an orbital period of about 470 years; the third component, a flare star, is located some distance away. All three are spectroscopic binaries. mv : 1.9 (A), 2.9 (B), 1.57 (AB); Mv : 0.5 (AB); spectral type: A1 V (A), A2 V (B); distance: 15 pc.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006

Castor

[′kas·tər]
(astronomy)
A multiple star of spectral classification A0 in the constellation Gemini; the star α Geminorum.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

castor

1. the brownish aromatic secretion of the anal glands of a beaver, used in perfumery and medicine
2. the fur of the beaver
3. a less common name for beaver
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
References in periodicals archive ?
Further information on the RE series of castors and wheels from Elesa UK can be found at www.elesa.com/en/elesab2bstoreuk/catalogo-cat-166-sales/castors-and-wheels--1 or follow them on twitter: www.twitter.com/ElesaUK.
Included in the assets purchased are all of the Colson Castors Ltd.
wood to the pallet first, if the area is smaller than the castor. This will also raise your table to a more userfriendly height.
"The porter then pushes a button which raises the castors off the ground, giving us far more control over the bed during movement."
He says when dealing with a new castor, smart operators will try out a small sample before buying a truckload.
PLEASE find enclosed a set of modified castor cups.
Revvo will be exhibiting twin wheel castors up to 11,500 kg capacity with 400 x 125 wheels (16 inches x 5 inches) for use with aircraft maintenance docks and stands.
Its Black Country furniture castor manufacturer Archibald Kenrick and Sons has bought for an undisclosed sum Orbit Manufacturing at Cradley Heath - the first move in a major growth plan.
The RE.F2-N castors and wheels are suitable for tiled or cement-resin floors.
Metheringham, United Kingdom, April 08, 2016 --(PR.com)-- The new Elesa Castors and Wheels catalogue offers a one-stop reference for their full range of castor assemblies and components for the industrial, office, medical, display, laboratory, engineering and associated industries.
The round seat rests on three castors and is intended as a 'place of retreat' where users can withdraw with their laptops and mobiles.