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The American Heritage Dictionary of the English Language, 4th edition, published by Houghton Mifflin Company
The American Heritage Dictionary provides clear and precise definitions along with an authoritative guide to usage. You can also check a word's spelling, syllabification and etymology, and hear an audio pronunciation.
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Title Index: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z 0-9
U:  < Previous  28  29  30  31  Next > 

uracil (material)
Ural-Altaic (language)
Uralic (language family)
Uralic-Yukaghir (language family)
Urania (muse of astronomy)
uranium (element, metal)
uranium 235 (uranium isotope with mass number)
uranium 238 (isotope of uranium)
urano- (prefix)
Uranus (7th planet from the sun)