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Iso-

1. (Science: prefix) a prefix that means equal or like.

2. (Science: chemistry) a prefix indicating isomer of (isomerism); e.g., isocyanate vs. cyanate.

3. (Science: immunology) a prefix designating sameness with respect to species; in recent years, the meaning has shifted to sameness with respect to genetic Constitution of individuals.

Origin: g. Isos, equal