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semi-arc
semi-arc n. 
/ˈsɛmiˌɑrk/
Brit. /ˈsɛmɪɑːk/
, /ˈsɛmɪɑːk/U.S. /ˈsɛˌmaɪˌɑrk/
, /ˈsɛˌmaɪˌɑrk//ˈsɛmiˌɑrk/ΚΠ
1794 Attwood in Philos. Trans. (Royal Soc.) 84 151 The balance commencing its vibration at the extremity of the arc B, after having passed the semiarc BO with an accelerated motion.
1858 Huxley in Proc. Royal Soc. (1859) 9 428 Each distal portion of the hæmal semi-arc.
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