Lewis & Short

1. stellĭo (stēlĭo), ōnis, m. [stella].

    1. A. A newt, stellion (having star-like spots on its back): Lacerto gecko, Linn.; Plin. 29, 4, 28, § 90; 11, 26, 31, § 91; Verg. G. 4, 243; Col. 9, 7, 5.
    2. B. Transf., a crafty, knavish person, Plin. 30, 10, 27, § 89; App. M. 5, p. 172, 19; cf. stellionatus.