reactive
re·ac·tive / rēˈaktiv/ • adj. showing a response to a stimulus: pupils are reactive to light. ∎ acting in response to a situation rather than creating or controlling it: a proactive rather than a reactive approach. ∎ having a tendency to react chemically: nitrogen dioxide is a highly reactive gas. ∎ Physiol. showing an immune response to a specific antigen. ∎ (of a disease or illness) caused by a reaction to something: reactive arthritis reactive depression. ∎ Physics of or relating to reactance: a reactive load.
reactive
reactive (ri-ak-tiv) adj. (in psychiatry) describing mental illnesses that are precipitated by events in the psychological environment. r. hypoglycaemia see hypoglycaemia.
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