Sentence:  A <WSD>mountaineer</WSD> can tread firm upon a precipice and walk erect without tottering along the path, that winds itself about the craggy cliff, on which he has his dwelling; whilst the inhabitant of the valley travels with affright and danger over the giddy pass ... 
Meaning of the word marked with <WSD> tags:  A person who lives in a mountainous area (often with the connotation that such people are outlaws or uncivilized).