Dictionary

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

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Orwellian (evocative of the works of George Orwell)
oryx (mammal)
Os (symbol)
Osage (indigenous people of North America)
Osage orange (dioecious spiny tree)
Oscan (language)
Oscar (film awards)
oscilloscope (mechanical device)