n.
Pronunciation: ' äk-t ə - ˌ gän
Function: noun
Etymology: Latin octagonum, from Greek oktag ō non, from okta- + -g ō non -gon
Date: 1639
: a polygon of eight angles and eight sides
– oc · tag · o · nal \ äk- ' ta-g ə -n ə l \ adjective
– oc · tag · o · nal · ly \ -n ə l- ē \ adverb