from the GNU version of the Collaborative International Dictionary of English
- adj. any action performed involuntarily in consequence of an impulse or impression transmitted along afferent nerves to a nerve center, from which it is reflected to an efferent nerve, and so calls into action certain muscles, organs, or cells.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. an automatic instinctive unlearned reaction to a stimulus
Sorry, no etymologies found.