eff /ef/ euphemistic for fuck, esp in effing (adj) and eff off

• photocopying
• photocopyings
• photocurrent
• photocurrents
• photodegradable
• photodiode
• photodiodes
• photodissociation
• photodynamic
• photoelastic
• photoelasticities
• photoelasticity
• photoelectric
• photoelectric cell
• photoelectricity
• photoelectrode
• photoelectrodes
• photoelectron
• photoelectronics
• photoelectrons
• photo-emission
• photo-engraving
• photo-essay
• photo-essays
• photo-etching