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semi-circumference
semi-circumference n. 
/ˈsɛmɪsəˌkʌmf(ə)rn̩s/, /ˈsɛmisərˌkəmf(ə)rəns/
Brit. /ˈsɛmɪsəˌkʌmf(ə)rəns/
, /ˈsɛmɪsəˌkʌmf(ə)rəns//ˈsɛmɪsəˌkʌmf(ə)rn̩s/U.S. /ˈsɛˌmaɪsərˌkəmf(ə)rəns/
, /ˈsɛˌmaɪsərˌkəmf(ə)rəns//ˈsɛmisərˌkəmf(ə)rəns/ΚΠ
1661 S. Partridge Descr. Double Scale Proportion 80 First get the Semidiameter, which in this example is 3, 5 inches, and also the Semicircumference, which here is 11.
1825 ‘J. Nicholson’ Operative Mechanic 83 Such a resistance will stop the wheel, as it is equal to the effort of all the buckets in one semi-circumference filled with water.
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