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pupil
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." A Dictionary of Astronomy. 1997. Encyclopedia.com. 11 Feb. 2012 <http://www.encyclopedia.com>. "pupil." A Dictionary of Astronomy. 1997. Encyclopedia.com. (February 11, 2012). http://www.encyclopedia.com/doc/1O80-pupil.html "pupil." A Dictionary of Astronomy. 1997. Retrieved February 11, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O80-pupil.html |
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pupil
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 Oxford Pocket Dictionary of Current English. 2009. Encyclopedia.com. 11 Feb. 2012 <http://www.encyclopedia.com>. "pupil." The Oxford Pocket Dictionary of Current English. 2009. Encyclopedia.com. (February 11, 2012). http://www.encyclopedia.com/doc/1O999-pupil.html "pupil." The Oxford Pocket Dictionary of Current English. 2009. Retrieved February 11, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O999-pupil.html |
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pupil
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. 11 Feb. 2012 <http://www.encyclopedia.com>. T. F. HOAD. "pupil." The Concise Oxford Dictionary of English Etymology. 1996. Encyclopedia.com. (February 11, 2012). http://www.encyclopedia.com/doc/1O27-pupil1.html T. F. HOAD. "pupil." The Concise Oxford Dictionary of English Etymology. 1996. Retrieved February 11, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O27-pupil1.html |
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pupil
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"pupil." World Encyclopedia. 2005. Encyclopedia.com. 11 Feb. 2012 <http://www.encyclopedia.com>. "pupil." World Encyclopedia. 2005. Encyclopedia.com. (February 11, 2012). http://www.encyclopedia.com/doc/1O142-pupil.html "pupil." World Encyclopedia. 2005. Retrieved February 11, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O142-pupil.html |
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pupil
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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Cite this article
T. F. HOAD. "pupil." The Concise Oxford Dictionary of English Etymology. 1996. Encyclopedia.com. 11 Feb. 2012 <http://www.encyclopedia.com>. T. F. HOAD. "pupil." The Concise Oxford Dictionary of English Etymology. 1996. Encyclopedia.com. (February 11, 2012). http://www.encyclopedia.com/doc/1O27-pupil.html T. F. HOAD. "pupil." The Concise Oxford Dictionary of English Etymology. 1996. Retrieved February 11, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O27-pupil.html |
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pupil
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." A Dictionary of Nursing. 2008. Encyclopedia.com. 11 Feb. 2012 <http://www.encyclopedia.com>. "pupil." A Dictionary of Nursing. 2008. Encyclopedia.com. (February 11, 2012). http://www.encyclopedia.com/doc/1O62-pupil.html "pupil." A Dictionary of Nursing. 2008. Retrieved February 11, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O62-pupil.html |
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pupil
pupil see eye . |
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"pupil." The Columbia Encyclopedia, 6th ed.. 2008. Encyclopedia.com. 11 Feb. 2012 <http://www.encyclopedia.com>. "pupil." The Columbia Encyclopedia, 6th ed.. 2008. Encyclopedia.com. (February 11, 2012). http://www.encyclopedia.com/doc/1E1-X-pupil.html "pupil." The Columbia Encyclopedia, 6th ed.. 2008. Retrieved February 11, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1E1-X-pupil.html |
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pupil
pupil See iris.
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"pupil." A Dictionary of Biology. 2004. Encyclopedia.com. 11 Feb. 2012 <http://www.encyclopedia.com>. "pupil." A Dictionary of Biology. 2004. Encyclopedia.com. (February 11, 2012). http://www.encyclopedia.com/doc/1O6-pupil.html "pupil." A Dictionary of Biology. 2004. Retrieved February 11, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O6-pupil.html |
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pupil
pupil See EYE.
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MICHAEL ALLABY. "pupil." A Dictionary of Zoology. 1999. Encyclopedia.com. 11 Feb. 2012 <http://www.encyclopedia.com>. MICHAEL ALLABY. "pupil." A Dictionary of Zoology. 1999. Encyclopedia.com. (February 11, 2012). http://www.encyclopedia.com/doc/1O8-pupil.html MICHAEL ALLABY. "pupil." A Dictionary of Zoology. 1999. Retrieved February 11, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O8-pupil.html |
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pupil
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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"pupil." Oxford Dictionary of Rhymes. 2007. Encyclopedia.com. 11 Feb. 2012 <http://www.encyclopedia.com>. "pupil." Oxford Dictionary of Rhymes. 2007. Encyclopedia.com. (February 11, 2012). http://www.encyclopedia.com/doc/1O233-pupil.html "pupil." Oxford Dictionary of Rhymes. 2007. Retrieved February 11, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O233-pupil.html |
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