WordReference Random House Unabridged Dictionary of American English © 2025
ac•tin•o•graph
(ak tin′ə graf′, -gräf′),USA pronunciation n.
ac•tin•o•graph•ic
(ak tin′ə graf′ik, ak′tə nō-),USA pronunciation adj.
ac•ti•nog•ra•phy
(ak′tə nog′rə fē),USA pronunciation n.
- Physicsa recording actinometer.
- 1830–40; actino- + -graph
'actinograph' also found in these entries (note: many are not synonyms or translations):