[ kak-tuh s ]
/ ˈkæk təs /

noun, plural cac·ti [kak-tahy] /ˈkæk taɪ/, cac·tus·es, cac·tus.

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


cac·tus·like, cac·toid, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Examples from the Web for cacti

British Dictionary definitions for cacti

/ (ˈkæktəs) /

noun plural -tuses or -ti (-taɪ)

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
cactus dahlia a double-flowered variety of dahlia

Derived forms of cactus

cactaceous (kækˈteɪʃəs), adjective

Word Origin for cactus

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