/in fyooh"zheuhn/ , n.
1. the act or process of infusing.
2. something that is infused.
3. a liquid extract, as tea, prepared by steeping or soaking.
4. Pharm.
a. the steeping or soaking of a crude drug in water.
b. the liquid so prepared.
5. Med.
a. the introduction of a saline or other solution into a vein.
b. the solution used.
[ 1400-50; late ME infusion- (s. of infusio ). See INFUSE, -ION ]