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demi-octangular
demi-octangular adj.
Brit. 
/ˌdɛmɪɒkˈtaŋɡjᵿlə/
, /ˌdɛmɪɒkˈtaŋɡjᵿlə/U.S. /ˌdɛmiˌɑkˈtæŋɡjələr/
of the shape of half of an octagon./ˌdɛmiˌɑkˈtæŋɡjələr/ΚΠ
1774 T. West Antiq. Furness (1805) 362 The ruins of the chapter-house, with four demi-octangular buttresses in front.
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