teph·ra 
(tĕfrə)
(tĕfrə)n.
Solid matter that is ejected into the air by an erupting volcano.
[Greek tephrā, ash; see dhegwh- in the Appendix of Indo-European roots.]
- 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
- photo-essayist
- photo finish
- photoflash
- photoflood
- photofluorogram