Dictionary.com
Thesaurus.com
Synonyms

tam

American  
[tam] / tæm /

tam British  
/ tæm /

noun

  1. short for tam-o'-shanter

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of tam

By shortening