Re‐act″ive (rē̍‐ăkt″ĭv), a. [Cf. F. réactif.] Having power to react; tending to reaction; of the nature of reaction. — Re‐act″ive‐ly, adv. — Re‐act″ive‐ness, n.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.