| 2025-03-31 | B-___ (rare blood type, informally) |
| 2022-07-31 | Darkroom item, in brief |
| 2020-12-17 | -: Abbr. |
| 2020-11-26 | -: Abbr. |
| 2020-08-17 | Less than zero: Abbr. |
| 2020-02-09 | Below zero: Abbr. |
| 2019-11-20 | Below zero: Abbr. |
| 2019-10-22 | -: Abbr. |
| 2019-08-24 | Blood type abbr. |
| 2018-10-28 | Abbr. in many blood type names |
| 2018-09-17 | Like one end of a battery: Abbr. |
| 2018-07-21 | Blood-typing abbr. |
| 2018-05-22 | Original of an old photo, informally |
| 2018-03-04 | Blood type modifier, for short |
| 2017-01-18 | Like rarer blood types: Abbr. |
| 2016-06-10 | Bit of blood-typing shorthand |
| 2015-11-05 | -: Abbr. |
| 2015-03-15 | -: Abbr. |
| 2014-01-19 | Follower of A, B or AB, informally |
| 2013-06-25 | Like the rarer blood types, typically: Abbr. |
| 2013-05-27 | Below zero: Abbr. |
| 2012-04-05 | Photog's master |
| 2011-08-23 | What "-" may mean: Abbr. |
| 2009-08-19 | Like some ions: Abbr. |
| 2009-06-01 | Less than zero: Abbr. |
| 2009-04-22 | Minus: Abbr. |
| 2008-03-24 | Photo image, briefly |
| 2006-10-22 | Photog's image |
| 2006-01-22 | One pole: Abbr. |
| 2004-10-17 | -: Abbr. |
| 2004-04-01 | Blood-typing abbr. |
| 2002-08-06 | Photo envelope enclosure, for short |
| 2002-07-12 | Darkroom master: Abbr. |
| 2002-04-07 | Photog's item |
| 2001-11-03 | Kind of charge: Abbr. |
| 2001-09-02 | Like some blood types: Abbr. |
| 2001-01-07 | Master of photog. |
| 2000-04-26 | Photog's item |
| 1999-12-23 | Item in a photog's file |
| 1999-10-04 | A photog saves it |
| 1999-07-17 | Master of photography: Abbr. |
| 1999-07-04 | Like certain battery terminals: Abbr. |
| 1999-05-08 | Item in a photog's file |
| 1999-04-10 | Kind of no. |
| 1997-04-14 | Not pos. |
| 1997-02-09 | Where black is white, for short? |
| 1996-12-12 | Reprint necessity: Abbr. |
| 1996-11-11 | Reverse image, for short |
| 1996-09-14 | Reverse image, for short |
| 1995-08-02 | Photographic image, for short |
| 1995-06-20 | Not pos. |
| 1994-07-31 | Pos. canceler |
| 1994-01-29 | Battery term. |