The term 'thunderbolt' is a combination of two words, 'THUNDER' and 'BOLT'. It is often used to describe a sudden, powerful, and destructive force, such as a lightning strike. The crossword solutions for the term 'thunderbolt' are 'BOLT', which is a metal rod or bar that is used to fasten two objects together, and '4 letters', which refers to the length of the word. Therefore, the crossword solutions for the term 'thunderbolt' can be summarized as a metal rod or bar used to fasten two objects together, which is four letters long.