ex·panse 
(ĭk-spăns)
(ĭk-spăns)n.
1. A wide and open extent, as of surface, land, or sky.
2.
a. Expansion.
b. The distance or amount of expansion.
[Latin expānsum, from neuter past participle of expandere, to spread out; see EXPAND.]
- photonegative
- photonic
- photonics
- photonuclear
- photo-offset
- photo op
- photo opportunity
- photoperiod
- photoperiodic
- photoperiodism
- photophilic
- photophilous
- photophobia
- photophobic
- photophore
- photophosphorylation
- photopia
- photopic
- photoplay
- photopositive
- photoproduct
- photoreaction
- photorealism
- photorealist
- photorealistic