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## cylinder

cylinder, in mathematics, surface generated by a line moving parallel to a given fixed line and continually intersecting a given fixed curve called the directrix; each line of the family of lines forming the cylinder is called a ruling, or generator. If the directrix is a conic section (e.g., a circle or a parabola), the cylinder is called a quadric cylinder. The commonest type of cylinder is the right circular cylinder, in which the directrix is a circle and the lines forming the cylinder are all perpendicular to the plane of the circle. The solid bounded by a cylindrical surface and two parallel planes intersecting the surface in closed curves is also called a cylinder. The perpendicular distance between the planes is the altitude of the cylinder. The volume of the cylinder is equal to the product of the altitude and the area of the base (the area enclosed by either closed curve).

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"cylinder." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. 10 Dec. 2017 <http://www.encyclopedia.com>.

"cylinder." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. (December 10, 2017). http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/cylinder

"cylinder." The Columbia Encyclopedia, 6th ed.. . Retrieved December 10, 2017 from Encyclopedia.com: http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/cylinder

## cylinder

cyl·in·der / ˈsiləndər/ • n. a solid geometric figure with straight parallel sides and a circular or oval section. ∎  a solid or hollow body, object, or part with such a shape. ∎  a piston chamber in a steam or internal combustion engine. ∎  a cylindrical container for liquefied gas under pressure. ∎  a rotating metal roller in a printing press. ∎  Archaeol. a cylinder seal. DERIVATIVES: cy·lin·dric / səˈlindrik/ adj. cy·lin·dri·cal / səˈlindrikəl/ adj. cy·lin·dri·cal·ly / səˈlindrik(ə)lē/ adv.

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"cylinder." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. 10 Dec. 2017 <http://www.encyclopedia.com>.

"cylinder." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. (December 10, 2017). http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/cylinder-0

"cylinder." The Oxford Pocket Dictionary of Current English. . Retrieved December 10, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/cylinder-0

## cylinder

cylinder or rotary valve. A special type of valve in brass instr., in much use in some European countries but in Brit. and USA applied only to the Fr. hn. The term is sometimes used for any kind of valve, e.g. It. trombone a cilindri (valve tb.).

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"cylinder." The Concise Oxford Dictionary of Music. . Encyclopedia.com. 10 Dec. 2017 <http://www.encyclopedia.com>.

"cylinder." The Concise Oxford Dictionary of Music. . Encyclopedia.com. (December 10, 2017). http://www.encyclopedia.com/arts/dictionaries-thesauruses-pictures-and-press-releases/cylinder

"cylinder." The Concise Oxford Dictionary of Music. . Retrieved December 10, 2017 from Encyclopedia.com: http://www.encyclopedia.com/arts/dictionaries-thesauruses-pictures-and-press-releases/cylinder

## cylinder

cylinder Solid figure or surface formed by rotating a rectangle using one side as an axis. If the vertical height is h and the radius of the base r, then the volume is πr2h and the curved surface area 2πrh.

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"cylinder." World Encyclopedia. . Encyclopedia.com. 10 Dec. 2017 <http://www.encyclopedia.com>.

"cylinder." World Encyclopedia. . Encyclopedia.com. (December 10, 2017). http://www.encyclopedia.com/environment/encyclopedias-almanacs-transcripts-and-maps/cylinder

"cylinder." World Encyclopedia. . Retrieved December 10, 2017 from Encyclopedia.com: http://www.encyclopedia.com/environment/encyclopedias-almanacs-transcripts-and-maps/cylinder

## cylinder

cylinder XVI. — L. cylindrus — Gr. kúlindros roller, f. kulindein roll.
So cylindrical XVII. f. modL. cylindricus — Gr. kulindrikós.

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"cylinder." The Concise Oxford Dictionary of English Etymology. . Encyclopedia.com. 10 Dec. 2017 <http://www.encyclopedia.com>.

"cylinder." The Concise Oxford Dictionary of English Etymology. . Encyclopedia.com. (December 10, 2017). http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/cylinder-1

"cylinder." The Concise Oxford Dictionary of English Etymology. . Retrieved December 10, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/cylinder-1

## cylinder

cylinderbidder, consider, Jiddah, kidder, whydah •bewilder, builder, guilder, Hilda, Matilda, St Kilda, Tilda, tilde •Belinda, Cabinda, cinder, Clarinda, Dorinda, hinder, Kinder, Linda, Lucinda, Melinda, tinder •Drogheda • shipbuilder • bodybuilder •coachbuilder • boatbuilder • Candida •spina bifida •calendar, calender •Phillida • cylinder • Phasmida •Andromeda • Mérida • Florida •Cressida • lavender • provender •chider, cider, divider, eider, glider, Guider, Haida, hider, Ida, insider, Oneida, outsider, provider, rider, Ryder, Saida, slider, spider, strider, stridor •Wilder •binder, blinder, finder, grinder, kinda, minder, ringbinder, winder •Fassbinder • spellbinder • highbinder •bookbinder • pathfinder •rangefinder • viewfinder • backslider •paraglider • childminder • outrider •joyrider • roughrider • ringsider •Tynesider • sidewinder