hedgehog cactus(n = noun.plant) - cactus of the genus Echinocactus having stout sharp spines;
is a kind of barrel cactus, echinocactus

barrel cactus, cactus, cactus euphorbia, cactus family, cactus mouse, cactus wren, christmas cactus, crab cactus, easter cactus, garambulla cactus, golden barrel cactus, hedgehog, hedgehog cereus, knowlton's cactus, mistletoe cactus, orchid cactus, pitahaya cactus, prickly pear cactus, rainbow cactus, rat's-tail cactus, rattail cactus, redbird cactus, russian cactus, sea hedgehog, thanksgiving cactus, vine cactus