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WWI abbreviation of "World War I," a major four-year war fought primarily in Europe between the Allies, including France, Great Britain, and the United States, and the Central Powers, including Germany and Austria-Hungary, that ended in 1918 with the collapse of the Central Powers; Great War.
WWII abbreviation of "World War II," the major war of 1939-45, fought between Germany, Italy, and Japan on one side, and Great Britain, the United States, and the Soviet Union on the other. It ended with the collapse of Germany and the surrender of Japan.
WY abbreviation of "Wyoming," a northwestern U.S. state between Montana and Colorado.
Wyandot a North American Indian tribe of the Huron confederacy, originally inhabiting Michigan, Ohio, and Ontario. [2 definitions]
wychelm a small European elm tree.
Wyoming a northwestern U.S. state between Montana and Colorado. (abbr.: WY)
X1 abbreviation of "persons under eighteen not admitted" (formerly used as a film rating).
X2 in Roman numeral notation, 10.
x1 to cross out (written or printed matter) with a mark or marks like an "x". [2 definitions]
x2 the twenty-fourth letter of the English alphabet. [6 definitions]
xanthan a natural gum produced by bacterial fermentation of glucose, used as a stabilizer or thickener in commercially prepared foods; xanthan gum.
xanthein the water-soluble part of the pigment in yellow flowers, or of yellow pigment in plant sap.
xanthic having a yellow or yellowish color. [2 definitions]
xanthine a crystalline nitrogenous compound found in blood, urine, and some animal and plant tissues. [2 definitions]
xantho- yellow.
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.