Historical clue formulations

• Tetra- plus two — 2016-04-17
• Tri and tri again? — 2016-03-01
• Prefix related to benzene's shape — 2015-08-15
• Dodeca- halved — 2015-01-14
• Six: Prefix — 2014-03-17
• Decimal starter — 2013-05-25
• One meter start? — 2012-11-24
• Six: Prefix — 2012-10-15
• Dodeca- halved — 2012-08-29
• Six: Prefix — 2011-07-03
• Prefix with -pod — 2011-02-13
• One more than penta- — 2011-01-24
• Prefix with meter — 2010-10-14
• Six: Prefix — 2008-11-03
• Prefix with meter — 2007-03-15
• Prefix with -hedron — 2005-04-15
• Prefix with syllabic — 2004-11-26
• Numerical prefix — 2003-10-05
• Dodeca- halved — 2003-07-03
• Prefix with -gon — 2003-03-05
• Prefix with -gon — 1999-01-13
• Penta- plus one — 1998-04-30
• Prefix with -gram — 1996-10-10
• Six: Prefix — 1996-08-06
• Prefix re honeycombs — 1994-05-26