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- ACTINIUMA radioactive, metallic chemical element (symbol: Ac) with an atomic number of 89; found in uranium ores. An atom of this element.
- ASCENDEURA metal grip that attaches to a rope sling and can be tightened to hold a climber or loosened to allow the climber to move.
- FRANCIUMThe chemical element (symbol Fr) with an atomic number of 87. It is an intensely radioactive alkali metal that is not found in nature. An atom of this element.
- FRIVOLITYfrivolous act
- GLYPTICSThe art of engraving on precious stones.