reactive

re·ac·tive  (r-ktv)

adj.

1. Tending to be responsive or to react to a stimulus.

2. Characterized by reaction.

3. Chemistry & Physics Tending to participate readily in reactions.

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re·active·ly adv.

re·active·ness, reac·tivi·ty n.

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reactive

Adjective

1. readily taking part in chemical reactions: ozone is a highly reactive form of oxygen gas

2. of or having a reactance

3. responsive to stimulus

reactively adv
reactivity n

Thesaurus

Adj.	1.	reactive - participating readily in reactions; "sodium is a reactive metal"; "free radicals are very reactive" chemical science, chemistry - the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions natural philosophy, physics - the science of matter and energy and their interactions; "his favorite subject was physics" unreactive - (chemistry) not reacting chemically
	2.	reactive - reacting to a stimulus; "the skin of old persons is less reactive than that of younger persons" responsive sensitive - responsive to physical stimuli; "a mimosa's leaves are sensitive to touch"; "a sensitive voltmeter"; "sensitive skin"; "sensitive to light"