Vomitus: Matter from the stomach that has come up into and may be ejected beyond the mouth, due to the act of vomiting. When vomitus is reddish or the color of coffee grounds, it may mean there is serious internal bleeding. The reddish color may herald fresh blood and dark blood may betoken blood that has been digested. Vomitus and vomit are synony... Found on http://www.medterms.com/script/main/art.asp?articlekey=33157