The Collaborative International Dictionary of English v.0.48:

loanword \loanword\ n.
   a word borrowed from another language; e.g. blitz is a German
   word borrowed into modern English.

   Syn: loan.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

loanword
    n 1: a word borrowed from another language; e.g. `blitz' is a
         German word borrowed into modern English [syn: loanword,
         loan]