[ mad-dawg, -dog ]
/ ˈmædˌdɔg, -ˌdɒg /
a North American skullcap, Scutellaria lateriflora, having underground stems and one-sided clusters of blue to white flowers.
Origin of mad-dog skullcap
An Americanism dating back to 1815–25; so called because it was formerly used as an antispasmodic
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019