antidiarrheal

n.
A substance used to prevent or treat diarrhea.

antidiarrheal an'ti·di'ar·rhe'al adj.

n.pl

Drugs which combat diarrhea by decreasing gastrointestinal motility; may cause sedation of the central nervous system and xerostomia.

(ăn'tē-dī'ə-rē'əl, an'tī-)
n.

A substance used to prevent or treat diarrhea.

1. counteracting diarrhea.
2. an agent that counteracts diarrhea.

• a. agents — medicines used as antidiarrheals in animals. Includes parasympatholytic drugs, e.g. atropine, which act as a spasmolytic or antispasmodic, opiates, protectants and absorbents, e.g. activated charcoal, kaolin and astringents, e.g. catechu, tannic acid. The classification does not include the treatments that are specific for the diseases that cause diarrhea, e.g. antibiotics.

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The noun has one meaning:

Meaning #1: a drug used to control or stop diarrhea
  Synonym: antidiarrheal drug

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