Of or relating to a hexagon; hexagonal (archaic or variant form).
A variant or archaic form of 'hexagonal,' formed by adding '-ial' (relating to) instead of '-al' to 'hexagon.' This form appears in older scientific texts but is largely superseded by 'hexagonal.'
This word is mostly found in 18th and 19th-century scientific papers—it's a ghost word that lost the competition with 'hexagonal' in the standardization of geometric terminology.
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