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semi-lens
semi-lens n. 
/ˈsɛmiˌlɛnz/
Brit. /ˈsɛmɪlɛnz/
, /ˈsɛmɪlɛnz/U.S. /ˈsɛˌmaɪˌlɛnz/
, /ˈsɛˌmaɪˌlɛnz//ˈsɛmiˌlɛnz/ΚΠ
1832 Nat. Philos. (Libr. Useful Knowl.) II. Optical Instruments xvii. 57 The divided object-glass micrometer is composed of two semilenses.
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