di·dac·tics 
(dī-dăktĭks)
(dī-dăktĭks)n. (used with a sing. or pl. verb)
Instruction; teaching; pedagogy.
- photocopy
- photocurrent
- photodecomposition
- photodegradable
- photodiode
- photodisintegration
- photoduplicate
- photoduplication
- photodynamic
- photodynamically
- photodynamics
- photodynamic therapy
- photoelectric
- photoelectrical
- photoelectrically
- photoelectric cell
- photoelectric effect
- photoelectron
- photoemission
- photoemission spectroscopy
- photoengrave
- photoengraver
- photoengraving
- photo-essay
- photo essay