n. An antihistamine and sedative drug that blocks the effect of histamine at H1 receptor sites, reducing smooth muscle contraction.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. antihistamine (trade name Benadryl) used to treat allergic reactions involving the nasal passages (hay fever) and also to treat motion sickness
Word Usage
"And the medicine known as diphenhydramine (found in many allergy medications and nighttime pain pills) has an “anticholinergic†effect; it blocks communication between nerve cells."