Dictionary![]() ![]() si•er•raPronunciation: (sē-er'u), [key] —n. 1. a chain of hills or mountains, the peaks of which suggest the teeth of a saw. 2. any of several Spanish mackerels of the genus Scomberomorus, esp. S. sierra, found in western North America. 3. a word used in communications to represent the letter S. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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