thunderbolt
Concise Oxford English Dictionary © 2008 Oxford University Press:
thunderbolt/ˈθʌndəbəʊlt/
▶noun a flash of lightning with a simultaneous crash of thunder.
■ a supposed bolt or shaft believed to be the destructive agent in a lightning flash, especially as an attribute of a god such as Jupiter or Thor.
'thunderbolt' also found in these Oxford entries:

