(uncommon) An act of gaping; a yawn.

A large opening.

(uncountable) A disease in poultry caused by gapeworm in the windpipe, a symptom of which is frequent gaping.

The width of an opening.

(zoology) The maximum opening of the mouth (of a bird, fish, etc.) when it is open.

(intransitive) To open the mouth wide, especially involuntarily, as in a yawn, anger, or surprise.

(intransitive) To stare in wonder.

(intransitive) To open wide; to display a gap.

(intransitive, of a cat) To open the passage to the vomeronasal organ, analogous to the flehming in other animals.

(pornography) To depict a dilated anal or vaginal cavity upon penetrative sexual activity.