Borborygmus is a noun that refers to the rumbling or gurgling noise made in the stomach. 

Our word of the day comes almost directly from a Greek noun that holds the same meaning. It’s been used mostly in medical circles since the early 18th century. Here’s an example:

There’s nothing more embarrassing than having a grumbling stomach in a quiet setting. A few weeks ago, I was in a bookstore when my borborygmus announced my hunger to the world — or at least everybody in the history section.