Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The sinoatrial node.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • abbr. The sinoatrial node.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a specialized bit of heart tissue that controls the heartbeat

Etymologies

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Examples

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