ther·mo·karst 
(thûrmō-kärst′)
(thûrmō-kärst′)n.
A landscape pattern formed by the melting of permafrost and characterized by patterns of hummocks and water-filled depressions.
- 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
- photoreception