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: acetanilide to achromatize.
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acetate (in chemistry)
acetic acid (in chemistry)
aceto- (prefix)
acetone (in chemistry)
acetylcholine (in biochemistry)
acetylene (in chemistry)
Achaean (native or inhabitant of Achaea)
Achaemenid (dynasty, Persia)
Achates (Greek &)
achene (fruit)
Achernar (star)
Acheron (river of woe)
Acheulian (stage of tool culture)
Achilles (Mythical Figure)
Achilles jerk (reflex bending of the foot)
Achilles tendon (in anatomy)
Achilles' heel (crucial weakness)
Achomawi (Native American people)