hinge line

noun
variants: or less commonly hinge

Definition of hinge line

1 a :an imaginary line on the earth's surface which can be regarded as a boundary between a stable region and one undergoing upward or downward movement
b :a line around which one wall of a fault may appear to have rotated with respect to the other wall
2 :the dorsal edge or border of a bivalve shell on which the hinge is situated

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