Relating to or characteristic of a heptahedron; having the geometric properties of a seven-faced solid.
From heptahedron plus the double suffix '-ic' and '-al', creating an emphatic adjective form. More redundant than 'heptahedral' but used in some technical contexts.
Scientists sometimes use redundant suffixes like this when precision matters—the extra '-ic' emphasizes the literal seven-sided nature, useful when distinguishing heptahedrical from heptahedral descriptions!
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