1. [ noun ] (botany) a cactus of the genus Ferocactus: unbranched barrel-shaped cactus having deep ribs with numerous spines and usually large funnel-shaped flowers followed by dry fruits
Related terms: cactus Ferocactus
2. [ noun ] (botany) any cactus of the genus Echinocactus; strongly ribbed and very spiny; southwestern United States to Brazil
Synonyms: echinocactus
Related terms: cactus golden_barrel_cactus hedgehog_cactus genus_Echinocactus
Similar spelling:   barrel_knot