| PHO | an occasion that lends itself to (or is deliberately arranged for) taking photographs that provide favorable publicity for those who are photographed |
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| PHO | an occasion that lends itself to (or is deliberately arranged for) taking photographs that provide favorable publicity for those who are photographed |
| PHO | a method of offset printing using photomechanical plates |
| PHO | a method of offset printing using photomechanical plates |
| PHO | a genus of fish in the family Anomalopidae |
| PHO | fish of deep dark waters having a light organ below each eye |
| PHO | a cathode that emits electrons when illuminated |
| PHO | a transducer used to detect and measure light and other radiations |
| PHO | of or relating to or produced by the effects of light on chemical systems |
| PHO | an exchange produced by the chemical action of radiant energy (especially light) |
| PHO | a chemical reaction produced by the action of light |
| PHO | branch of chemistry that deals with the chemical action of light |