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semi-scale
semi-scale n. 
/ˈsɛmiˌskeɪl/ half or some fraction of full-scale; usually attributive.
Brit. /ˈsɛmɪskeɪl/
, /ˈsɛmɪskeɪl/U.S. /ˈsɛˌmaɪˌskeɪl/
, /ˈsɛˌmaɪˌskeɪl//ˈsɛmiˌskeɪl/ΚΠ
1946 Nature 7 Sept. 337/2 It is impossible in chemical engineering and many other branches of applied science to conduct research entirely in the laboratory; full-scale or semi-scale plant must be used.
1973 Nature 2 Feb. 319/1 In ‘semi-scale’ tests (about a tenth the size of a real reactor) water failed..to stay in the test vessel.
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