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
Sorry, no etymologies found.