UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/kæsˈkɑːrə/US:USA pronunciation: respellingUSA pronunciation: respelling(kas kârə)

WordReference Random House Unabridged Dictionary of American English © 2020
cas•car•a  (kas kârə),USA pronunciation n. 
  1. Plant Biologya buckthorn, Rhamnus purshiana, of the Pacific coast of the U.S., having finely toothed leaves and flowers in umbels and yielding cascara sagrada. Also called  cascara buckthorn, bearberry, chittamwood. 
  • Spanish cáscara bark, perh. akin to cascar to crack Vulgar Latin *quassicāre, equivalent. to Latin quass(āre) to shatter (see quash) + -icā- formative verb, verbal suffix + -re infinitive ending
  • 1875–80, American.

Collins Concise English Dictionary © HarperCollins Publishers::
cascara /kæsˈkɑːrə/ n
  1. See cascara sagrada

  2. Also called: cascara buckthorn, bearwood a shrub or small tree, Rhamnus purshiana of NW North America, whose bark is a source of cascara sagrada: family Rhamnaceae
Etymology: 19th Century: from Spanish: bark, from cascar to break, from Vulgar Latin quassicāre (unattested) to shake violently, shatter, from Latin quassāre to dash to pieces
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