jil·lion 
(jĭlyən)
(jĭlyən)n.
Informal
Informal
An indefinitely large number.
[On the model of MILLION, BILLION, etc.]
jil′lion·aire (jĭl′yə-nâr) n.
jillionth adj. & n.
- photorealist
- photorealistic
- photoreception
- photoreceptive
- photoreceptor
- photoreconnaissance
- photorefractive
- photoresistor
- photorespiration
- photosensitive
- photosensitivity
- photosensitization
- photosensitize
- photosensitizer
- photoset
- photosetter
- photosphere
- photospheric
- photostat
- photosynthate
- photosynthesis
- photosynthesize
- photosynthetic
- photosynthetically
- phototactic