The term STRAD is a reference to Antonio Stradivari, an Italian luthier and a crafter of string instruments from the 17th and 18th centuries. The two crossword solutions for this term are VIOL, which is a four-letter word for a bowed string instrument, and VIOLIN, which is a six-letter word for a bowed string instrument that is held between the chin and shoulder. Both words refer to instruments that were crafted by Stradivari.