| Noun | 1. | Scleroderma bovista - an earthball with a peridium that is firm dry and smooth when young but developing cracks when mature; pale orange-yellow when young and reddish brown at maturity genus Scleroderma, Scleroderma - genus of poisonous fungi having hard-skinned fruiting bodies: false truffles earthball, hard-skinned puffball, puffball, false truffle - any of various fungi of the genus Scleroderma having hard-skinned subterranean fruiting bodies resembling truffles |