- A lens or combination of lenses that enlarges the image of an object.放大镜：能放大物体图象的透镜或者一组透镜
- freestone
- freestone water
- freestyle
- free-swimming
- free-swinging
- freethinker
- free thought
- free throw
- free-throw line
- Freetown
- free trade
- free university
- free verse
- freeware
- freeway
- free-weight
- freewheel
- free wheel
- freewheeling
- freewill
- free will
- Free Will Baptist Bible College
- free world
- freeze
- freeze-dry