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Oceanus Procellarum
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octagon

oc·ta·gon [ óktə gòn ] (plural oc·ta·gons)


noun 
Definition:
 
eight-sided shape: a two-dimensional geometric figure formed of eight sides and eight angles

[Late 16th century. Via Latin< Greek oktagōnon< oktagōnos "eight-angled" < okto "eight" + < gōnia "angle"]

oc·tag·o·nal [ ok tággən'l ] adjective
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