control

(kon-tr51') [L. contra, against, roiula, roll; a counter-roll or ledger for check-accounts.] 1. To verify an experiment by means of another with the crucial condition omitted, as when a given amoimt of toxin is injected into two rabbits of equal weight, one receiving antitoxin, the other not; if the animal not receiving antitoxin (the control) dies, the a umption is that the other would also have succumbed without the protective injection of antitoxin. 2. Control-animal, control-experiment.