From The Collaborative International Dictionary of English v.0.48 [gcide]:
2. (Med.) The act or operation of transferring the blood of one man or animal into the vascular system of another; also, the introduction of any fluid into the blood vessels, or into a cavity of the body from which it can readily be adsorbed into the vessels; intrafusion; as, the peritoneal transfusion of milk.
From WordNet (r) 3.0 (2006) [wn]:
The dictionary definitions are retrieved from a local copy of two of the open source DICT dictionaries. Click here for the database copyright information. DEFINE.COM is registered as an educational NONPROFIT corporation. We aim to please around here. We believe in using positive reinforcement to get things done. We make suggestions that are intended to make life more enjoyable. We think about efficiency, automation, security, PRIVACY, social and ecological responsibility and positive HUMANITARIAN ethics and VALUES. We are benevolent. DO NO HARM is our motto.