Longman Dictionary of Contemporary English homepage

Date: 1500-1600
Language: Latin
Origin: octagonum, from Greek, from okta- 'eight' + -gonon '-gon'

octagon

 noun
     
Related topics: Shapes, Patterns, Maths
oc‧ta‧gon [countable]
CF a flat shape with eight sides and eight angles
—octagonal adjective:
an octagonal tower
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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