hippo/ʹhipoh/ noun (pl hippos collectively hippo)

• photolysis
• photolyze
• photo messaging
• photometer
• photomicrograph
• photomontage
• photomosaic
• photomultiplier
• photon
• photo-offset
• photo opportunity
• photoperiod
• photophobia
• photophore
• photopositive
• photorealism
• photoreceptor
• photosensitise
• photosensitive
• photosensitize
• photosetting
• photoshop
• photosphere
• Photostat
• photostat