n.
Function: noun
Date: 1535
1 : an act of gaping: a : YAWN b : an openmouthed stare
2 : an unfilled space or extent
3 a : the median margin-to-margin length of the open mouth b : the line along which the mandibles of a bird close c : the width of an opening
4 plural but singular in construction a : a disease of birds and especially young birds in which gapeworms invade and irritate the trachea b : a fit of yawning