hinge line

variants: or less commonly hinge

Definition of hinge line 

1a : 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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