Abbreviation for 6-mercaptopurine ribonucleoside (or 6-thioinosine).
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International System of Units [Fr. Systeme International d'Unites]; sacroiliac; saline infusion; saline injection; saturation index; self-inflicted; sensory integration; septic inflammation; serious illness; serum iron; severity index; sex inventory; shock index; signal intensity; Singh Index; single injection; sinus irregularities; small intestine; social interaction; soluble insulin; special intervention; spirochetosis icterohaemorrhagica; stability index; stimulation index; stress incontinence; stroke index; structured interview; sucrase isomaltase; sulfoxidation index; superior-inferior; suppression index; syncytium-inducer
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1. Systиme International d'Unitйs, or International System of Units. See under unit. 2. stimulation index; see lymphocyte proliferation test, under test.Medical dictionary. 2011.