Etymology
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sierra (n.)

"a range of hills," 1610s, from Spanish sierra "jagged mountain range," literally "saw," from Latin serra "a saw" (compare serrated), which is of unknown origin.

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Definitions of sierra

sierra (n.)
a range of mountains (usually with jagged peaks and irregular outline);
sierra (n.)
a Spanish mackerel of western North America;
Synonyms: Scomberomorus sierra
From wordnet.princeton.edu