| optimum | The best or most suitable; e.g., denoting the dose of a remedy likely to give most benefit with fewest side effects, the temperature or pH at which an enzyme has maximal activity. Origin: L. Ntr. Sing. Of optimus, best (05 Mar 2000) |
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| optimum dose | The dose of a drug or radiation that will produce the desired effect with minimum likelihood of undesirable symptoms. (05 Mar 2000) |
| optimum pH | <biochemistry> The pH at which an enzyme has maximum potency and efficiency. (09 Oct 1997) |
| optimum temperature | The temperature at which any operation, such as the culture of any special microorganism, is best carried on. (05 Mar 2000) |