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semi-hexagon
semi-hexagon n. 
/ˈsɛmiˌhɛksəˌɡɑn/
Brit. /ˈsɛmɪˌhɛksəɡ(ə)n/
, /ˈsɛmɪˌhɛksəɡ(ə)n/U.S. /ˈsɛˌmaɪˌhɛksəˌɡɑn/
, /ˈsɛˌmaɪˌhɛksəˌɡɑn//ˈsɛmiˌhɛksəˌɡɑn/ΚΠ
1796 J. Morse Amer. Universal Geogr. (new ed.) I. 528 A handsome court-house 100 feet by 50, with a semi-hexagon at each end.
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