| a. | 1. | Having power to react; tending to reaction; of the nature of reaction. |
| Adj. | 1. | reactive - participating readily in reactions; "sodium is a reactive metal"; "free radicals are very reactive" Antonyms: unreactive - not reacting chemically |
| 2. | reactive - tending to react to a stimulus; "the skin of the geriatric is less reactive than that of younger persons"- Louis Tuft |
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