1. The sucking proboscis of various insects

Derived forms: haustella

• photocathode
• photocell
• photochemical
• photochemical exchange
• photochemical reaction
• photochemistry
• photocoagulation
• photocoagulator
• photoconduction
• photoconductive
• photoconductive cell
• photoconductivity
• photocopier
• photocopy
• photodegradable
• photoelectric
• photoelectric cell
• photoelectric emission
• photoelectrical
• photoelectrically
• photoelectricity
• photoelectron
• photoemission
• photoemissive
• photoengrave