Pertaining to, expressive of, proceeding from, or exhibiting sympathy, in any sense; attended with sympathy.Having sympathy or common feeling with another; susceptible of being affected by feelings like those of another, or of altruistic feelings which arise as a consequence of what another feels.Harmonious; concordant; congenial.In anatomy and zoology, effecting a sympathy or consentaneous affection of the viscera and blood-vessels; uniting viscera and blood-vessels in a nervous action common to them all; inhibitory of or controlling the vital activities of viscera and blood-vessels, which are thereby subjected to a common nervous influence; specifically, of or pertaining to a special set of nerves or nervous system called the sympathetic. See below.In acoustics, noting sounds induced not by a direct vibration-producing force, but by vibrations conveyed through the air or other medium from a body already in vibration. The phenomena of resonance are properly examples of sympathetic sound.of four pairs of cranial ganglia;of three great gangliated plexuses or sympathetic plexuses, in the thoracic, abdominal, and pelvic cavities respectively;of smaller ganglia in connection with the abdominal and other viscera;of communicating nerves or commissures, whereby these ganglia or plexuses are connected with one another and with nerves of the cerebrospinal system;of distributory nerves supplying the viscera and vessels, whereby the sympathetic reaches all parts of the body. See ganglion and plexus.In invertebrates, as Vermes, a posterior part of the visceral nervous system, passing on to the enteric tube, and corresponding to a true enteric nervous system: so called in view of its physiological relations, without reference to the actual homology implied with the sympathetic system of a vertebrate.n. The sympathetic nervous system, or the sympathetic nerve.n. One who is peculiarly susceptible, as to hypnotic or mesmeric influences; a sensitive.