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supraoptimal
supraoptimal adj. 
/ˌsjuːprəˈɒptᵻml/,
Brit. /ˌsuːprəˈɒptᵻml/
, /ˌsuːprəˈɒptᵻml//ˌsjuːprəˈɒptᵻml/U.S. /ˌsuprəˈɑptəm(ə)l/
/ˌsuprəˈɑptəm(ə)l/ΚΠ
1901 Amer. Jrnl. Physiol. Jan. 478 Under supra-optimal stimulation the angle at which the animal encounters the back wall..favors further progress away from the source of light.
2010 Life Sci. Weekly (Nexis) 29 June 1076 Interestingly, transferring the plants previously challenged with supraoptimal salinities..to the optimal salinity..substantially restored their growth activity.
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