ejection, forcing out, expulsion, projection - the act of expelling or projecting or ejecting

rumination - regurgitation of small amounts of food; seen in some infants after feeding

haematemesis, hematemesis - vomiting blood

hyperemesis - severe and excessive vomiting

inborn reflex, innate reflex, instinctive reflex, physiological reaction, reflex, unconditioned reflex - an automatic instinctive unlearned reaction to a stimulus