An alternate or archaic spelling of 'dihedral,' relating to a solid with two faces or an angle formed by two intersecting planes.
From the same Greek roots as 'diedral' ('di-' meaning two, 'hedra' meaning face), this is an older variant spelling found in historical technical texts.
These variant spellings remind us that scientific terminology has evolved—older texts use 'diedric' where modern chemists and geometers use 'dihedral' to describe molecular structures.
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