| tithonic | Of, pertaining to, or denoting, those rays of light which produce chemical effects; actinic. Origin: L. Tithonius belonging to Tithonus, the consort of Aurora, Gr. Source: Websters Dictionary (01 Mar 1998) |
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| tithonicity | <chemistry> The state or property of being tithonic; actinism. Source: Websters Dictionary (01 Mar 1998) |