Merriam-Webster's Collegiate® Dictionary, 11th Edition
POUT
I. verb
Etymology: Middle English
Date: 14th century
intransitive verb
1. to show displeasure by thrusting out the lips or wearing a sullen expression, sulk , protrude , transitive verb to cause to protrude ,
II. noun
Date: 1591
a protrusion of the lips expressive of displeasure, a fit of pique,
III. noun (plural pout or pouts)
Etymology: probably from Middle English *poute, a fish with a large head, from Old English -pūte; akin to Middle English pouten to pout
Date: 1591
any of several large-headed fishes (as a bullhead or eelpout)