Wiktionary
a. (of an animal) having three horns
Usage examples of "three-horned".
Beaming parents handed their children up for rides upon camels from the Calimshan deserts or an enormous three-horned lizard from the jungles of Chult or an aged and rather threadbare unicorn.
When the three-horned lizard tried to enter his home the boy poked him with a sharp thorn sword and the lizard ran away.
Under the personal supervision of the Three-Horned Inquisitor and the Patriarch of Pasadena, a devoted band of Familiars and Postulants has traveled from settlement to settlement, making the yearly census.
With a wide sweep of his hand he indicated Nayila's newly collected animals, the snarling three-horned haigus, the dwarf dhumkar, the single-eyed canavong, the dhiims: everything bizarre and frightful, everything taut with dark hunger and rage.