1. photosynthesis formation of compounds in plants aided by radiant energy
  2. juxtaposition the act of positioning close together
  3. footstep the sound of a step of someone walking
  4. photostat a photocopy made on a Photostat machine
  5. Photostat a duplicating machine that makes quick positive or negative copies directly on the surface of prepared paper
  6. phototropism an organism's orienting response to light
  7. protoceratops small horned dinosaur
  8. photometrist someone who practices photometry
  9. pit stop a stop during an automobile trip for rest and refreshment
  10. widow's weeds a black garment worn by a widow as a sign of mourning
  11. tidytips California annual having flower heads with yellow rays tipped with white
  12. photosensitize make (an organism or substance) sensitive to the influence of radiant energy and especially light
  13. photosensitise make (an organism or substance) sensitive to the influence of radiant energy and especially light
  14. photoretinitis damage to the retina resulting from exposure of the eye to the sun without adequate protection
  15. flight of steps a stairway between one floor or landing and the next
  16. photosynthetic relating to or using or formed by photosynthesis
  17. footstool a low seat or a stool to rest the feet of a seated person
  18. photosphere the intensely luminous surface of a star
  19. radioisotope a radioactive isotope of an element
  20. fetoscopy prenatal diagnosis that allows direct observation of a fetus in the uterus and the withdrawal of fetal blood