from The American Heritage® Dictionary of the English Language, 4th Edition
- n. An abnormality in an otherwise normal rhythmic pattern, as of brain waves being recorded by an electroencephalograph.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A disturbance to an otherwise normal rhythm (especially of the heart)
from The Century Dictionary and Cyclopedia
- n. In pathology, an occasional disturbance of rhythm.
New Latin : dys- + Latin rhythmus, rhythm; see rhythm.(American Heritage® Dictionary of the English Language, Fourth Edition)