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xanthous yellow. [2 definitions]
x-axis in a two-dimensional coordinate system, the horizontal axis, along which the x ordinates are measured. [2 definitions]
X-C abbreviation of "cross-country."
X chromosome the sex chromosome that occurs paired in females and singly in males, and is responsible for female sex characteristics. (Cf. Y chromosome.)
Xe symbol of the chemical element xenon.
xebec a small, three-masted Mediterranean sailing ship with square and triangular sails, and with an overhanging bow and stern.
xeno- strange; foreign.
xenon a chemical element of the inert gas group that has fifty-four protons in each nucleus and that is used as the atmosphere in fluorescent lamps because it glows with a blue light when excited by electricity. (symbol: Xe)
xenophilia a liking for foreigners or strangers or for foreign or strange things.
xenophobe a person who fears or detests foreigners, strangers, or anything that is foreign or strange.
xenophobia excessive or unreasoning fear or hatred of foreign people or things.
xero- dry.
xerography a copying process in which the original image is reproduced on paper or the like with a resinous powder by the action of light on an electrically charged surface.
xerophilous capable of surviving or flourishing in esp. hot arid regions.
xerophyte a plant that can grow in a very dry or desert environment, and that often has fleshy parts and hairs or thorns, such as an agave or cactus.
Xerox trademark for a process of copying printed material by xerography, or the machine used for this process. [3 definitions]
X Games a competitive sporting event with winter and summer versions, featuring a variety of extreme sports, held every few years in different cities.
Xhosa a member of one of the Bantu peoples living mainly in Cape Province, South Africa. [2 definitions]
xi the name of the fourteenth letter of the Greek alphabet.
Xing abbreviation of "crossing."
XL abbreviation of "extra large."