Might mean (unverified): Boundary or difference between areas.
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  1. gapeline: Wiktionary

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Definitions from Wiktionary (gapeline)

▸ noun:  (ornithology) The outer edge of a bird's gape, especially when enlarged in a chick or immature bird.

Similar:
gape, gapping, gorge, gullet, gape seed, gapeseed, girthline, gigerium, gander, gaper, more...

Opposite:
overlap, intersection, connection

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Similar:
gape, gapping, gorge, gullet, gape seed, gapeseed, girthline, gigerium, gander, gaper, more...

Opposite:
overlap, intersection, connection



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