Etymology
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arrhythmia (n.)

in medicine, "irregularity of pulse" (arrhythmia cordis), 1888, from Greek noun of action from arrhythmos "irregular, unrhythmical," from a- "not" (see a- (3)) + rhythmos "measured flow or movement, rhythm; proportion, symmetry" (see rhythm). A nativized form arrhythmy, in reference to metrics, is attested from 1844.

updated on September 25, 2022

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Definitions of arrhythmia from WordNet

arrhythmia (n.)
an abnormal rate of muscle contractions in the heart;
Synonyms: cardiac arrhythmia
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.