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mad-dog skullcap

American  
[mad-dawg, -dog] / ˈmædˌdɔg, -ˌdɒg /

noun

Botany.

  1. a North American skullcap, Scutellaria lateriflora, having underground stems and one-sided clusters of blue to white flowers.

Etymology

Origin of mad-dog skullcap

An Americanism dating back to 1815–25; so called because it was formerly used as an antispasmodic

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.