gape

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gape

the width of the widely opened mouth of a vertebrate
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

gape

[gāp]
(anatomy)
The margin to margin distance between open jaws.
(invertebrate zoology)
The space between the margins of a closed mollusk valve.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.