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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 .


Yawning definition, being or standing wide open; gaping: the yawning mouth of a cave. See more.


Define yawn: to open wide : gape — yawn in a sentence.


Define yawning: wide open : cavernous; showing fatigue or boredom by yawns — yawning 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.


The reflex that makes you open your mouth wide, inhale, and then exhale is called a yawn. Even seeing photos of other people's yawns (or reading the word  ...


Define yawn. yawn synonyms, yawn pronunciation, yawn translation, English dictionary definition of yawn. v. yawned , yawn·ing , yawns v. intr. 1. To open the ...