1. To render activity.

2. To become active.

3. <chemistry> To convert (a compound, as a provitamin or enzyme) into an active form or different compound, especially. Into one that has a particular biological action (for example ergosterol by irradiation to vitamin D2 for use in treating rickets).

(13 Nov 1997)

action research, action tremor, Actis, activase < Prev | Next > activated acetaldehyde, activated amino acid

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