A yawn is a reflex consisting of the simultaneous inhalation of air and the stretching of the .... Gordon Gallup, who hypothesizes that yawning may be a means of keeping the brain cool, also hypothesizes that "contagious" yawning may be a ...
Yawn definition, to open the mouth somewhat involuntarily with a prolonged, deep inhalation and sighing or heavy exhalation, as from drowsiness or boredom .
Define yawn: to open your mouth wide while taking in breath usually because you are tired or bored — yawn in a sentence.
Jun 28, 2013 ... Pinpointing exactly why we yawn is a tough task, but the latest research ... which means it tends to heat up more than other organ systems.
yawn definition, meaning, what is yawn: to open the mouth wide and take a lot of air into the lungs and slowly send it out…. Learn more.
To open the mouth wide with a deep inhalation, usually involuntarily from drowsiness, fatigue, or boredom. 2. To open wide; gape: The chasm yawned at our feet ...
involuntarily open one's mouth wide and inhale deeply due... Meaning, pronunciation, example sentences, and more from Oxford Dictionaries.
Read medical definition of Yawn.
Aug 12, 2002 ... A number of theories regarding the genesis of yawning have been presented over the years. Some evidence suggests that yawning is a means ...