Boul·der 
(bōldər)
(bōldər) A city of north-central Colorado northwest of Denver. It is a major Rocky Mountains resort and the seat of the University of Colorado (opened 1877).
- photoreaction
- photorealism
- photorealist
- photorealistic
- photoreception
- photoreceptive
- photoreceptor
- photoreconnaissance
- photorefractive
- photoresistor
- photorespiration
- photosensitive
- photosensitivity
- photosensitization
- photosensitize
- photosensitizer
- photoset
- photosetter
- photosphere
- photospheric
- photostat
- photosynthate
- photosynthesis
- photosynthesize
- photosynthetic