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From The Collaborative International Dictionary of English v.0.48:
Cairn \Cairn\, n. [Gael. carn, gen. cairn, a heap: cf. Ir. & W. carn.] 1. A rounded or conical heap of stones erected by early inhabitants of the British Isles, apparently as a sepulchral monument. [1913 Webster] Now here let us place the gray stone of her cairn. --Campbell. [1913 Webster] 2. A pile of stones heaped up as a landmark, or to arrest attention, as in surveying, or in leaving traces of an exploring party, etc. --C. Kingsley. Kane. [1913 Webster]