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hemiplane
hemiplane n.
Brit. 
/ˈhɛmᵻpleɪn/
, /ˈhɛmᵻpleɪn/U.S. /ˈhɛməˌpleɪn/
Geometry half a plane./ˈhɛməˌpleɪn/ΚΠ
1892 G. B. Halsted Elem. Synth. Geom. 5 Any straight line in a plane cuts it into two parts called hemiplanes.
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