hill Copy link Outline 1. collis, is, m. (any considerable natural elevation, whether covered with verdure or rocky)2. tŭmŭlus (any rising ground, esp. an isolated mound or low h.)3. clīvus • hill: 1. collis, is, m. (any considerable natural elevation, whether covered with verdure or rocky): well-tilled and verdant h.s, c. nitidi viridesque, Cic. Verr. 3, 18, 47: a steep and precipitous h., c. arduus et deruptus, Tac. A. 2, 80: Caes.: Plin. 2. tŭmŭlus (any rising ground, esp. an isolated mound or low h.): h.s that (seem to) overhang, t. imminentes (i. e. Romae), Liv. 3, 7 (but the seven hills of Rome are usu. called colles): Caes. 3. clīvus: v. slope, incline. See also height (II.).