Webster's English Dictionary

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hexagonal

hex.ag.o.nal \hek-'sag-*n-*l\ \-*l-e-\ aj 1: having six angles and six 
   sides  2: having a hexagon as section or base  3: relating to or being a 
   crystal system characterized by three equal late ral axes intersecting at 
   angles of 60 degrees and a vertical axis of variable length at right angles 
   - hex.ag.o.nal.ly av