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X-rated of a film, performance, or the like, formerly given, or deserving of, a rating of X because of its explicit sexual activity, obscenity, or violence. (see X.)
x-ray a beam of high-energy photons that is able to ionize gases and pass through dense solids. [4 definitions]
xylem a plant's woody tissue that carries water and mineral salts.
xylo- wood.
xylophone a percussion instrument having a series of graduated metal or wooden bars that sound the notes of the chromatic scale when struck with small wooden mallets.
xylose a white crystalline sugar used in diabetic diets and for dyeing and tanning.
-y1 full of; made of; characterized by. [4 definitions]
-y2 condition; quality. [4 definitions]
Y symbol of the chemical element yttrium.
y the twenty-fifth letter of the English alphabet. [4 definitions]
yacht any of various sailing or motor-driven vessels used for private cruises, racing, or the like. [2 definitions]
yachting the act, practice, or sport of sailing, cruising, or racing in a yacht.
yachtsman a man who owns or navigates a yacht.
yachtswoman a woman who owns or navigates a yacht.
yah used to express defiance, scorn, or ridicule.
Yahoo in the eighteenth-century novel Gulliver's Travels by Jonathan Swift, one of a race of brutish, degraded, humanlike creatures. [3 definitions]
Yahweh a rendering of the pronunciation of the letters YHVH, used in Hebrew to represent the unutterable name of God; Jehovah.
yak1 a heavily built, long-haired, wild or domesticated ox of Tibet and Central Asia.
yak2 (slang) to talk long and idly; chatter. [2 definitions]
yakitori a Japanese dish consisting of bite-sized pieces of marinated meat, usu. chicken, that is placed on skewers with vegetable pieces and grilled.
Yalta Conference the February 1945 meeting of U.S. President Franklin D. Roosevelt, Soviet Premier Joseph Stalin, and British Prime Minister Winston Churchill at Yalta, Crimea, U.S.S.R.