Etymology
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saddleback (n.)

1540s and thereafter in various senses in reference to things (landforms, oysters, etc.) shaped like a saddle, from saddle (n.) + back (n.). Related: Saddle-backed.

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Definitions of saddleback

saddleback (n.)
a double sloping roof with a ridge and gables at each end;
Synonyms: gable roof / saddle roof / saddleback roof
saddleback (n.)
a pass or ridge that slopes gently between two peaks (is shaped like a saddle);
Synonyms: saddle
From wordnet.princeton.edu