| 单词 | reaction |
| 释义 | reaction —reactional, adj. —reactionally, adv. /ree ak"sheuhn/, n. 1. a reverse movement or tendency; an action in a reverse direction or manner. 2. movement in the direction of political conservatism or extreme rightism. 3. action in response to some influence, event, etc.: the nation's reaction to the President's speech. 4. Physiol. action in response to a stimulus, as of the system or of a nerve, muscle, etc. 5. Med. a. the action caused by the resistance to another action. b. a return to the opposite physical condition, as after shock, exhaustion, or chill. 6. Bacteriol. , Immunol. the specific cellular response to foreign matter, as in testing for allergies. 7. Chem. the reciprocal action of chemical agents upon each other; chemical change. 8. Also called nuclear reaction. Physics. a process in which a nucleus that is bombarded by a photon, particle, or other nucleus, emits a nucleon, alpha particle, or the like, without a significant change in its atomic weight. 9. Mech. the instantaneous response of a system to an applied force, manifested as the exertion of a force equal in magnitude but opposite in direction to the applied force. 10. Com. a decline in the market after an advance in prices. [1635-45; RE- + ACTION, modeled on react] |
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