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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vitamin (food)
vitamin A (fat-soluble vitamin or a mixture of vitamins)
vitamin A (yellow crystalline compound)
vitamin A (golden yellow oil)
vitamin B complex (group of water-soluble vitamins)
vitamin D (crystalline compound)
vitamin D (fat-soluble vitamin)
vitamin D (colorless crystalline compound)
vitamin E (fat-soluble vitamins)
vitamin K (vitamin)
vitamin K (fat-soluble vitamin)
vitamin K (vitamin)
vitamin P (water-soluble vitamin)