1) Danish surname 
Thomsen is a Danish patronymic surname meaning `son of Tom (or Thomas)`, itself derived from the Aramaic תום or Tôm, meaning `twin`. There are many varied surname spellings, with the first historical record believed to be found in 1252. Thomsen is uncommon as a given name. People with the surname Thomsen include: ...
Type: Term Pronunciation: tom′sen Definitions: 1. Asmus J., Danish geneticist, 1815-1896. See: Thomsen disease