a. [ F. montagneux, L. montaniosus. ] 1. Full of, or containing, mountains; as, the mountainous country of the Swiss. [ 1913 Webster ]
2. Inhabiting mountains. [ Obs. ] Bacon. [ 1913 Webster ]
3. Large as, or resembling, a mountain; huge; of great bulk; as, a mountainous heap. Prior. [ 1913 Webster ]
n. The state or quality of being mountainous. [ 1913 Webster ]