Having a soothing, calming, or tranquilizing effect; reducing or relieving anxiety, stress, irritability, or excitement.
An agent or a drug having a soothing, calming, or tranquilizing effect.
[Middle English, from Old French sedatif, from Medieval Latin sēdātīvus, from Latin sēdātus, past participle of sēdāre, to calm; see SEDATE1.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. 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.