Usage of "word balloon"

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Graphic convention in comics for representing speech.

Usage of word balloon in English

But the idea was it was supposed to be a word balloon. 
 Wired 

Each keystroke displays an upper body, a lower body, or a word balloon. 
 Wired 

The caricature of Scorpius had a word balloon coming out of its mouth. 
 James Potter and the Curse of the Gatekeeper 

What will happen when word balloons and art panels mutate to fit the space defined by multimedia? 
 Wired 

He would have word balloons that popped over his head and you would see what he was thinking. 
 Wired 

The word ballooned in his brain until it crowded out everything else and was the only word left. 
 The Incredible Shrinking Man 

There are no sequential panels or word balloons but rather beautiful, moody splash pages with occasional story notes along the borders. 
 Reuters 

Meanings of word balloon in English