n. a condition in which an organism shows no signs of motion, as in death feigning or freezing behavior. This may occur in response to sudden stimuli that might be associated with a predator, or it may be elicited in a fear-conditioning study as a learned response to an aversively conditioned signal. —immobileadj.
n. an inflammation of the pancreas, marked by severe abdominal pain and caused by biliary tract disorders (e.g., gallstones), alcoholism, viral infection, or reactions to certain drugs (e.g., some antipsychotic agents).