Sca‐le′no‐he″dron (–drŏn), n. [Gr. σκαληνόσ uneven + ἕδρα seat, base.] (Crystallog.) A pyramidal form under the rhombohedral system, inclosed by twelve faces, each a scalene triangle.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.