Tithonic :: Tithonic (a.) Of, pertaining to, or denoting, those rays of light which produce chemical effects; actinic..
Tithonicity :: Tithonicity (n.) The state or property of being tithonic; actinism.
Tithonographic :: Tithonographic (a.) Of, relating to, or produced by, the chemical action of rays of light; photographic..
Tithonometer :: Tithonometer (n.) An instrument or apparatus for measuring or detecting tithonicity; an actinometer.