Lewis & Short

mŏnŏcōlus, i, m., = μονόκωλος, onelegged, epithet applied to a fabled race of giants, each with but one leg of prodigious strength (post-Aug.): hominum genus, qui monocoli vocarentur, singulis cruribus, Plin. 7, 2, 2, § 23; cf. Gell. 9, 4, 9; Sol. 52, 29.