Medical term:
yawning
yawn·ing
(yawn'ing),The act of producing a yawn.
Synonym(s): oscitation
Farlex Partner Medical Dictionary © Farlex 2012
yawn
(yan)To open the mouth involuntarily and take a deep breath, a movement mediated by neurotransmitters in the hypothalamus. It is often accompanied with stretching. and is associated with drowsiness, boredom, anxiety, or fatigue.
yawning (yan′ing) Medical Dictionary, © 2009 Farlex and Partners
yawning
An involuntary and often infectious act of slow, deep inspiration accompanied by an almost uncontrollable desire to open the mouth widely. The purpose of yawning remains a matter of speculation but it stretches and opens the air sacs of the lungs and helps to improve the return of blood to the heart, reducing blood stagnation and increasing its oxygen content.Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005
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