Webster's Revised Unabridged Dictionary · 1913

Cascara sagrada

Cascara sagrada (kȧs"kȧ*rȧ sȧ*gra"dȧ)

[Sp.]

Holy bark; the bark of the California buckthorn (Rhamnus Purshianus), used as a mild cathartic or laxative; -- called also cascara.