Definition of looper
1 : any of the usually rather small hairless caterpillars that are mostly larvae of moths (families Geometridae and Noctuidae) and move with a looping motion in which the hind prolegs draw the posterior body toward the front followed by forward extension by the anterior legs —called also inchworm
2 : one that loops
First Known Use of looper
Learn More about looper
Britannica.com: Encyclopedia article about looper
Seen and Heard
What made you want to look up looper? Please tell us where you read or heard it (including the quote, if possible).