Related Clues:

• Caustic matter
• Part of RNA
• Alkali in cleansers
• Sulphuric or nitric
• Boric, e.g.
• Low-pH substance
• Sour-tasting substance
• Carbolic and sulphuric ender
• Base neutralizer
• KOH, to a layperson
• Scathing
• Target of milk of magnesia
• Drain-opening stuff
• It turns litmus paper red
• The ''A'' in DNA