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Table of Contents POS
HYPHEN
WORDNET DICTIONARY
CIDE DICTIONARY
OXFORD DICTIONARY

reactive

Adjective

re=ac=tive

WORDNET DICTIONARY

reactive(a = adj.all) Array - participating readily in reactions; "sodium is a reactive metal"; "free radicals are very reactive"

noun

Antonym: unreactive

reactive(s = adj.all) responsive - reacting to a stimulus; "the skin of old persons is less reactive than that of younger persons"

Derived forms verb react₁, noun reactivity₁

reactive, a. [Cf. F. réactif.].

Having power to react; tending to reaction; of the nature of reaction. [1913 Webster]

reactive, adj.
1 showing reaction.
2 of or relating to reactance.

Derivative

reactivity n.

For further exploring for "reactive" in Webster Dictionary Online