Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun Arrest of the cardiac electrical impulse in either the anterior or the posterior division of the left branch of the bundle of His.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun A heart block occurring within the fascicles of the left bundle branch.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

hemi- +‎ block

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