any small insectivorous burrowing lizard of the genus Phrynosoma, inhabiting desert regions of America, having a flattened toadlike body covered with spines: family Iguanidae (iguanas)
horned toad in American English
US
any of a genus (Phrynosoma) of small, scaly, insect-eating iguanas with a flattened body, short tail, and hornlike spines