| parameter | A variable whose measure is indicative of a quantity or function that cannot itself be precisely determined by direct methods, for example, blood pressure and pulse rate are parameters of cardiovascular function and the level of glucose in blood and urine is a parameter of carbohydrate metabolism. (18 Nov 1997) |
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| constituent enzyme | <biochemistry> Any of many enzymes that a cellmust have at all times to stay alive. (09 Oct 1997) |