INFUSION, med. jur. A pharmaceutical operation, which consists in pouring a hot or cold fluid upon a substance, whose medical properties it is desired to extract. Infusion is also used for the product of this operation. Although infusion differs from decoction, (q. v.) they are said to be ejusdem generis; and in the case of an indictment which charged the prisoner with giving a decoction, and the evidence was that he had given an infusion, the difference was held to be immaterial. 8 Camp. R. 74.