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 ]

adj. piled up, like a cairn. [ WordNet 1.5 ]

[ Gael. carn a cairn + gorm azure. ] (Min.) A smoky yellow or brown variety of rock crystal, or crystallized quartz, found especially, in the mountain of Cairngorm, in Scotland.
Syn. -- smoky quartz. [ 1913 Webster + WordNet 1.5 ]