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1.
graphic ornamentation consisting primarily of "twisted and winding viney things"
"Today’s decorative leanings, however, appear to lean less to the geometrical than the overtly botanical. I’ve participated in judging several juried exhibitions this year in which I’ve seen a preponderance of twisted and winding viney things, which I’ve taken to referring to as “thornament.”" - Jessica Helfand, April 11, 2006 10:35 AM, Design Observer
by a designer April 13, 2006
 
2.
Thornaments are Christmas tree ornaments that stab you while you are hanging them on your tree.
Where's Jay? He's at the E.R. He had a really bad thornaments accident while trimming his tree.
by Askthe BeerGuys December 21, 2010