reactive

[ ree-ak-tiv ]

adjective

1. tending to react.
2. pertaining to or characterized by reaction.
3. Electricity. pertaining to or characterized by reactance.

reactive

/ rɪˈæktɪv; ˌriːækˈtɪvɪtɪ /

adjective

1. readily partaking in chemical reactions

   free radicals are very reactive

   sodium is a reactive metal

2. of, concerned with, or having a reactance
3. responsive to stimulus
4. (of mental illnesses) precipitated by an external cause

   reactive depression

Derived Forms

• reˈactively, adverb
• reactivity, noun

Other Words From

• re·active·ly adverb
• re·active·ness noun
• anti·re·active adjective
• hyper·re·active adjective
• nonre·active adjective
• over·re·active adjective
• unre·active adjective

Word History and Origins

Origin of reactive¹

First recorded in 1705–15; react + -ive

Example Sentences

These broadly reactive antibodies likely represent a common mechanism of acquired immunity to severe malaria and offer novel insights for the design of a PfEMP1-based vaccine or treatment targeting severe malaria.

From Science Daily

However, even though it is necessary to maintain cell functions, oxygen also causes oxidative stress by forming free radicals, reactive molecules that endanger the cell.

From Science Daily

"Molecular metal hydrides can be reactive and have low stability," Rohde said.

From Science Daily

"Locking these kids up is just a reactive way to go about it," says Darren Damaso, a youth leader for Brother 2 Another.

From BBC

Burgos said that, for her, abolition means moving away from “reactive” law enforcement responses and toward expanded social services, such as job training, job placements and mental health care.

From Los Angeles Times

Related Words

• conscious
• delicate
• emotional
• hypersensitive
• keen
• nervous
• perceptive
• precise
• receptive
• responsive
• susceptible
• tense
• touchy
• tricky
• unstable