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From The Collaborative International Dictionary of English v.0.48:
Gape \Gape\, n. 1. The act of gaping; a yawn. --Addison. [1913 Webster] 2. (Zool.) The width of the mouth when opened, as of birds, fishes, etc. [1913 Webster] The gapes. (a) A fit of yawning. (b) A disease of young poultry and other birds, attended with much gaping. It is caused by a parasitic nematode worm (Syngamus trachealis), in the windpipe, which obstructs the breathing. See Gapeworm. [1913 Webster]