am·phet·a·mine (ăm-fĕtə-mēn′, -mĭn)
A synthetic compound, C9H13N, that occurs as a racemic mixture of two stereoisomers or as one of its stereoisomers (especially dextroamphetamine), derivatives (such as methamphetamine), or salts. Amphetamine acts as a central nervous system stimulant, and various formulations are used in the medical treatment of certain conditions (such as attention deficit hyperactivity disorder) and illegally as stimulants.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2022 by HarperCollins Publishers. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.