Noun
(uncountable) A genre of Italian cinema mixing mystery and thriller with psychological elements.
(countable) A film in this genre.
Source: en.wiktionary.orgI don't really consider myself an American filmmaker like, say, Ron Howard might be considered an American filmmaker. If I'm doing something and it seems to me to be reminiscent of an Italian giallo, I'm gonna to do it like an Italian giallo. Quentin Tarantino
For his devotion to Mussolini, the satirical magazine Il Becco Giallo used to call him P. Randello (randello in Italian means club ). Source: Internet