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pupil

pupil

A Dictionary of Astronomy | 1997 | Copyright

pupil The aperture in the iris, the coloured area of the eye. The iris is a diaphragm which opens and closes to vary the amount of light admitted to the eye. Pupil size varies between 2.5 mm and nearly 9 mm, depending on the light conditions and the individual. The maximum, dark-adapted pupil size decreases with a person's age from an average of 7 mm to about 5 mm. Observers should avoid using low-power eyepieces which give an exit pupil larger than their eye can accept, thus wasting light.
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pupil

The Oxford Pocket Dictionary of Current English | 2009 | Copyright

pu·pil1 / ˈpyoōpəl/ • n. a student in school. pu·pil2 • n. the dark circular opening in the center of the iris of the eye, varying in size to regulate the amount of light reaching the retina. DERIVATIVES: pu·pil·lar·y / ˈpyoōpəˌlerē/ (also pu·pil·ar·y) adj.

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pupil

The Concise Oxford Dictionary of English Etymology | 1996 | | Copyright

pupil2 circular opening in the iris of the eye. XVI. — (O)F. pupille or L. pūpilla, dim. of pūpa girl, doll, pupil of the eye (see prec.). The application of the L. words to the pupil of the eye is based on, or parallel to, that of Gr. kórē- maiden, girl, doll, pupil (the allusion being to the tiny images of persons and things that may be seen therein).
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T. F. HOAD. "pupil." The Concise Oxford Dictionary of English Etymology. 1996. Encyclopedia.com. 26 May. 2012 <http://www.encyclopedia.com>.

T. F. HOAD. "pupil." The Concise Oxford Dictionary of English Etymology. 1996. Encyclopedia.com. (May 26, 2012). http://www.encyclopedia.com/doc/1O27-pupil1.html

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pupil

World Encyclopedia | 2005 | Copyright

pupil In the structure of the eye, circular aperture through which light falls onto the lens; it is located in the centre of the iris. Its diameter changes by reflex action of the iris to control the amount of light entering the eye.
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pupil

The Concise Oxford Dictionary of English Etymology | 1996 | | Copyright

pupil1 orphan who is a minor and hence a ward XIV; one under instruction XVI. — (O)F. pupille m. and fem. or its source, L. pūpillus, -illa orphan, ward, dim. of pūpus boy, pūpa girl.
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pupil

A Dictionary of Nursing | 2008 | Copyright

pupil (pew-pil) n. the circular opening in the centre of the iris, through which light passes into the lens of the eye.
—pupillary (pew-pil-er-i) adj.
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pupil

The Columbia Encyclopedia, 6th ed. | 2011 | Copyright

pupil see eye .

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pupil

A Dictionary of Biology | 2004 | Copyright

pupil See iris.
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pupil

A Dictionary of Zoology | 1999 | | Copyright

pupil See EYE.
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MICHAEL ALLABY. "pupil." A Dictionary of Zoology. 1999. Encyclopedia.com. 26 May. 2012 <http://www.encyclopedia.com>.

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pupil

Oxford Dictionary of Rhymes | 2007 | Copyright

pupil •apple, chapel, chappal, Chappell, dapple, grapple, scrapple •scalpel •ample, trample •pineapple •carpal, carpel •example, sample •sepal •stemple, temple •maple, papal, staple •peepul, people, steeple •tradespeople • sportspeople •townspeople • workpeople •cripple, fipple, nipple, ripple, stipple, tipple, triple •dimple, pimple, simple, wimple •Oedipal • maniple • manciple •municipal •principal, principle •participle • multiple •archetypal, disciple, typal •prototypal •hopple, popple, stopple, topple •gospel •Constantinople, copal, nopal, opal, Opel •duple, pupal, pupil, scruple •quadruple • septuple • sextuple •quintuple • octuple •couple, supple •crumple, rumple, scrumple •syncopal • episcopal • purple

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Free newspaper and magazine articles

Assisting pupils in Mathematics achievement (the common core standards).(Report)
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PUPILS EXPELLED FOR BEING DRUNK; Others kicked out for taking drugs and...
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PUPIL POWER PAYS; THIS week Education Reporter Ben Turner went to Wallasey's...
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