Usually means: Antihistamine used for allergies, sedation.
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We found 22 dictionaries that define the word diphenhydramine:

General (13 matching dictionaries)
  1. diphenhydramine: Merriam-Webster
  2. diphenhydramine: Oxford Learner's Dictionaries
  3. diphenhydramine: Collins English Dictionary
  4. diphenhydramine: Vocabulary.com
  5. Diphenhydramine, diphenhydramine: Wordnik
  6. diphenhydramine: Wiktionary
  7. diphenhydramine: Infoplease Dictionary
  8. diphenhydramine: Dictionary.com
  9. Diphenhydramine: Wikipedia, the Free Encyclopedia
  10. diphenhydramine: Rhymezone
  11. diphenhydramine: FreeDictionary.org
  12. diphenhydramine: Mnemonic Dictionary
  13. diphenhydramine: TheFreeDictionary.com

Medicine (9 matching dictionaries)
  1. diphenhydramine: Merriam-Webster Medical Dictionary
  2. Dorland's Illustrated Medical Dictionary (No longer online)
  3. Medical Dictionary (No longer online)
  4. Diphenhydramine: Merck Manuals
  5. online medical dictionary (No longer online)
  6. Allergy Glossary (No longer online)
  7. diphenhydramine: Dictionary of Cancer Terms
  8. RxList The Internet Drug Index (No longer online)
  9. diphenhydramine: Medical dictionary

Definitions from Wiktionary (diphenhydramine)

noun:  (pharmacology) An antihistamine and anticholinergic drug that blocks the effect of histamine at H₁ receptor sites, relieving allergy symptoms. It also reduces smooth muscle contraction, increases heart rate, and sedates the user by blocking muscarinic acetylcholine receptors (mAChRs).

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