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.
On this page: river basin to roaring.
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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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rivet (mechanical device, construction)
rivière (necklace of precious stones)
Rn (symbol)
RNA (polymeric constituent)
RNA polymerase (polymerase)
RNA virus (RNA-containing virus)
Roach Motel (trademark for a cockroach trap)
road (in transportation)