Related Clues:

• Caustic stuff
• Caustic chemical
• Battery component
• Kind of rock or rain
• Sourish
• Tart-tasting
• Aspirin, e.g.
• Citric ___
• Test subject
• Fruity dessert
• Word with indigestion or test
• Barbed, in a way
• Bakery treat
• Fruit-filled dessert
• Key lime pie, or its taste