Related Clues:

• Sulphuric, for one
• It has a pH below 7
• Hardly complimentary
• Maliciously derogatory
• Nastily derogatory
• Rock type
• Sulfuric substance
• It was dropped at Woodstock
• Said with a 71 Across
• Trip provider?
• Ugly, as a remark
• Base's counterpart
• Digestive fluid
• Folic ___
• Inspiration for Hunter S. Thompson