[ kak-tuhs ]

noun,plural cac·ti [kak-tahy], /ˈkæk taɪ/, cac·tus·es, cac·tus.
  1. any of numerous succulent plants of the family Cactaceae, of warm, arid regions of the New World, having fleshy, leafless, usually spiny stems, and typically having solitary, showy flowers.

Origin of cactus

1600–10; <Latin <Greek káktos cardoon

Other words from cactus

  • cac·tus·like, cactoid, adjective

Words Nearby cactus Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use cactus in a sentence

British Dictionary definitions for cactus


/ (ˈkæktəs) /

nounplural -tuses or -ti (-taɪ)
  1. any spiny succulent plant of the family Cactaceae of the arid regions of America. Cactuses have swollen tough stems, leaves reduced to spines or scales, and often large brightly coloured flowers

  2. cactus dahlia a double-flowered variety of dahlia

Origin of cactus

C17: from Latin: prickly plant, from Greek kaktos cardoon

Derived forms of cactus

  • cactaceous (kækˈteɪʃəs), adjective

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012