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semi-disk
semi-disk n. 
/ˈsɛmiˌdɪsk/
Brit. /ˈsɛmɪdɪsk/
, /ˈsɛmɪdɪsk/U.S. /ˈsɛˌmaɪˌdɪsk/
, /ˈsɛˌmaɪˌdɪsk//ˈsɛmiˌdɪsk/ΚΠ
1784 W. Herschel in Philos. Trans. (Royal Soc.) 74 265 The semi-disk, which is full, is evidently part of an oblate spheroid.
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