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icosaedrum

icosaëdrum [LL < εἰκοσάεδρος] , icosahedron, solid figure having twently triangular faces. tertia [figura] habet viginti superficies triangulares et vocatur ~um [MS: icocedrum] ab εἲκοσι[MS: eikosi] quod est viginti Bacon Maj. I 160; omne namque corpus hujusmodi est pyramis, cubus, octoedron, duodecaedron, ~on, vel sphera Bradw. CD 120C.

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