pho·tot·o·nus 
(fō-tŏtn-əs)
(fō-tŏtn-əs)n.
The state of being sensitive to or irritated by light.
pho′to·tonic (fō′tə-tŏnĭk) adj.
- cryophilic
- cryophilous
- cryopreservation
- cryopreserve
- cryoprobe
- cryoprotectant
- cryoprotective
- cryoscope
- cryoscopic
- cryoscopy
- cryostat
- cryostatic
- cryosurgeon
- cryosurgery
- cryosurgical
- cryotherapy
- cry over spilled milk
- crypt
- crypt-
- crypt-
- cryptanalysis
- cryptanalyst
- cryptanalytic
- cryptanalyze
- cryptesthesia