'Tithonic' definitions:
Definition of 'Tithonic'
From: GCIDE
- Tithonic \Ti*thon"ic\, a. [L. Tithonius belonging to Tithonus, the consort of Aurora, Gr. ?.] Of, pertaining to, or denoting, those rays of light which produce chemical effects; actinic. [R.] [1913 Webster]