Having the shape or properties of a decagon; relating to or shaped like a ten-sided polygon.
From decagon + -al (adjective suffix). The suffix -al transforms the noun decagon into an adjective describing something that possesses the qualities of a decagon.
The word decagonal lets mathematicians quickly describe complex structures—instead of saying 'shaped like a ten-sided polygon,' they can just say 'decagonal,' which shows how specialized vocabulary makes science communication faster!
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