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.

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.

Castor

[′kas·tər]
(astronomy)
A multiple star of spectral classification A0 in the constellation Gemini; the star α Geminorum.

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
References in periodicals archive ?
Paint the pallet in your chosen colours and use castors to create a rustic but mobile table for your garden.
Fixed wheel bracket castors, and castor wheels alone without brackets are available if required.
Martinek says operators should take advantage of trade shows and seminars to learn about new technology and to meet castors and manufacturers.
It is still designed to support the natural curves of the body and is available with a high or low back, in fabric or leather; armrests and castors are optional.
If I understand your idea, when you fit your castors to the bottom of the piece of furniture it makes it easier to slide over carpets, rather than popping out of the castors when being moved.
Wheel and castor makers Colson Europe have developed a range of heat and chill-resistant, and pressure-washable, castors for use in bakeries and other parts of the food industry.
Originally founded in 1925, the Revvo Castor Company is a major UK manufacturer of heavy-duty castors and wheels.
Mr Gordon Brown, chairman of Kenrick and head of the Spire Group, said: "We are extremely pleased with the acquisition and believe that the added range of castors and additional customers will considerably strengthen the company's position in the market place.
Today we take all the effort saving appliances at home for granted - dish washer, electric lawnmower, power drill - not so long ago we used good old fashioned elbow grease - yet essentially, our travel luggage has not been updated for over 20 years when castors were first introduced.
Easy to erect and reconfigure, some of the tables are provided with castors so that they can be shifted to create meeting places, group workspaces and individual desks.
The round seat rests on three castors and is intended as a 'place of retreat' where users can withdraw with their laptops and mobiles.
The top-loading water tank is the easiest one to remove, empty and replace, but the lack of castors made it hard to move, despite its fairly light weight (12kg).