riva /rivˈə or rēˈvə/ (Shetland)

A cleft in rock

• photoperiod
• photoperiodic
• photoperiodicity
• photoperiodism
• photoperiodisms
• photoperiods
• photophil
• photophilic
• photophilies
• photophilous
• photophils
• photophily
• photophobe
• photophobes
• photophobia
• photophobias
• photophobic
• photophone
• photophones
• photophonic
• photophonies
• photophony
• photophore
• photophores
• photophoreses