cactus /ˈkæktəs/noun 3adjective 1forms 3 noun3 •Any member of the family Cactaceae, a family of flowering New World succulent plants suited to a hot, semi-desert climate.On the mountains a few junipers and piñons are found, and cactuses, agave, and yuccas, low, fleshy plants with bayonets and thorns. — 1895 •Any succulent plant with a thick fleshy stem bearing spines but no leaves, such as euphorbs. •A vivid green color inspired by the color of cacti. adjective1 •(Australia, slang) Non-functional, broken, exhausted, dead.I wouldn't mind throwing it away if it's cactus except for the VCR part which works fine, so then I'd be up for a new VCR as well. — 2001 formscacti · cactuses · cactusses