| 2026-07-27 | Low scorer on a pH test |
| 2026-04-26 | What gives a wine tartness |
| 2026-04-03 | Influence on the Beatles' "I Am the Walrus" |
| 2026-01-30 | Certain psychedelic |
| 2025-10-06 | The "A" in DNA |
| 2025-08-31 | What wine or citrus adds to a sauce |
| 2025-05-22 | It burns |
| 2025-05-04 | What vinegar or lemon juice adds to a dressing |
| 2025-04-06 | Word before rain or wash |
| 2025-03-28 | Component of an exfoliator, often |
| 2025-03-25 | Not a base |
| 2024-07-07 | Vinegar, e.g. |
| 2024-06-17 | Base's opposite, in chemistry |
| 2024-01-29 | Something people trip on |
| 2023-06-18 | ___ rock |
| 2023-03-14 | Like biting wit |
| 2022-10-22 | Something a person typically drops on purpose |
| 2022-03-10 | Drop it! |
| 2022-02-23 | "Salt Fat ___ Heat" (popular cookbook) |
| 2022-01-04 | "He'd be a broader guy if he had dropped ___ once": Steve Jobs on Bill Gates |
| 2022-01-03 | You'll trip on it if you drop it |
| 2021-12-19 | See 89-Across |
| 2021-11-30 | Very harsh, as comments |
| 2021-11-06 | Kind of rock |
| 2021-10-26 | Battery liquid |
| 2021-09-11 | Word with rain or rock |
| 2021-07-12 | The "A" of DNA |
| 2021-06-15 | Something you might trip on |
| 2021-06-11 | Sharp |
| 2021-04-28 | What's anything but basic? |
| 2021-03-07 | Bitter |
| 2021-02-21 | Biting |
| 2021-02-15 | Chemical that burns |
| 2020-06-06 | ___ jazz |
| 2020-06-03 | If you drop this, you're sure to trip |
| 2020-05-12 | It's below 7 on the pH scale |
| 2020-01-14 | Gastric juice, e.g. |
| 2020-01-06 | The "A" in DNA |
| 2019-12-19 | Battery fill |
| 2019-06-05 | Word with rain or rock |
| 2019-05-26 | Anything but basic |
| 2019-01-18 | Biting |
| 2018-09-17 | At the lower side of the pH scale |
| 2018-07-05 | Tart |
| 2018-06-19 | Litmus paper reddener |
| 2018-05-04 | Sharp |
| 2018-03-19 | Gastric ___ |
| 2017-11-28 | Tums target |
| 2017-08-28 | Battery fluid |
| 2017-07-09 | Sharp |
| 2017-04-11 | Alkali neutralizer |
| 2017-01-12 | Biting |
| 2016-10-24 | Anything below 7 on the pH scale |
| 2016-09-27 | If you drop this you'll trip |
| 2016-08-15 | Boric ___ |
| 2016-06-01 | Pepto-Bismol target |
| 2016-05-15 | Stomach stuff |
| 2015-12-17 | Biting |
| 2015-11-30 | Low-pH substance |
| 2015-11-09 | The "A" in DNA |
| 2015-09-23 | Word before test or trip |
| 2015-01-13 | LSD |
| 2014-12-19 | Indigestion cause |
| 2014-06-25 | Liquid that burns |
| 2014-04-08 | The "A" in RNA |
| 2014-02-18 | Trip provider? |
| 2014-01-30 | What lemon adds to a dish, in food lingo |
| 2014-01-28 | ___ rock |
| 2014-01-21 | ___ wash jeans |
| 2013-12-29 | You'll trip if you drop it |
| 2013-05-11 | It's not basic |
| 2013-03-19 | Nitric ___ |
| 2013-01-07 | Sulfuric ___ |
| 2012-04-15 | It's not basic |
| 2012-02-19 | Kind of rock |
| 2012-01-23 | Battery fluid |
| 2012-01-01 | Low-pH compound |
| 2011-06-19 | Lemon juice, e.g. |
| 2011-01-15 | Eating stuff |
| 2010-05-02 | Vinegar, for one |
| 2009-12-25 | Kind of rock |
| 2009-09-13 | Base's opposite |
| 2009-07-22 | It was dropped in the '60s |
| 2009-03-06 | Breakdown cause |
| 2009-02-11 | Timothy Leary dropped it |
| 2009-01-14 | Inspiration for Hunter S. Thompson |
| 2008-07-13 | Aspirin, e.g. |
| 2008-04-05 | Mordant |
| 2008-02-01 | Mordant |
| 2008-01-07 | Carbolic ___ |
| 2007-10-12 | Target of milk of magnesia |
| 2007-09-10 | Hydrochloric ___ |
| 2007-03-19 | The "A" in DNA |
| 2006-10-24 | Battery fluid |
| 2006-01-15 | 91-Across, e.g. |
| 2005-12-25 | Biting |
| 2005-11-20 | Burn cause |
| 2005-10-10 | Hydrofluoric ___ |
| 2005-02-16 | Battery contents |
| 2005-01-13 | Vicious |
| 2004-09-05 | Cause of much bellyaching? |
| 2004-08-19 | It has a low pH |
| 2004-07-27 | Like gastric juice |
| 2004-06-29 | Like gastric juice |
| 2004-04-23 | See 26-Down |
| 2004-03-22 | Etching liquid |
| 2003-12-08 | Corrosive liquid |
| 2003-09-28 | See 17-Down |
| 2003-09-22 | ___ reflux |
| 2003-08-07 | Another name for 30-Down |
| 2003-07-28 | Battery fluid |
| 2003-05-14 | Etcher's fluid |
| 2003-02-04 | Battery liquid |
| 2002-12-26 | It was dropped in the 60's |
| 2002-04-08 | Citric ___ |
| 2002-03-06 | Aspirin, e.g. |
| 2001-06-26 | It has a low pH |
| 2001-01-22 | Amino ___ |
| 2000-12-17 | Parietal cell secretion |
| 2000-08-24 | Boric ___ |
| 2000-04-23 | Kind of rock |
| 2000-04-03 | Amino, for one |
| 1999-11-24 | More than sarcastic |
| 1999-10-11 | Ascorbic ___ |
| 1999-07-06 | Etcher's need |
| 1999-04-01 | Kind of wit or test |
| 1998-10-24 | Sharp |
| 1998-09-23 | Etcher's need |
| 1998-09-03 | Word with rock or rain |
| 1998-07-15 | LSD |
| 1998-06-21 | Kind of indigestion |
| 1998-06-14 | Nasty |
| 1998-06-10 | Tart |
| 1998-04-03 | Stomach botherer |
| 1998-02-03 | Kind of test or rain |
| 1998-01-16 | ___ test |
| 1997-07-29 | Kind of rain |
| 1997-02-24 | Battery fluid |
| 1996-12-11 | Kind of rock |
| 1996-11-03 | Extremely sharp |
| 1996-07-10 | Sour |
| 1996-02-18 | Kind of test |
| 1996-02-15 | Having a pH value of less than 7 |
| 1996-01-30 | LSD |
| 1995-12-31 | Stinging |
| 1995-11-24 | Baseless? |
| 1995-08-04 | It reddens litmus paper |
| 1995-07-17 | Nasty, as a comment |
| 1995-06-06 | Kind of tongue |
| 1995-04-05 | LSD |
| 1994-12-02 | Kind of rock |
| 1994-06-07 | Fatty _____ |
| 1994-04-06 | Folic, e.g. |
| 1994-03-07 | _____ rain |
| 1994-01-24 | Sarcasm |
| 1994-01-03 | Tart |