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countable and uncountable, plural palpitations
An abnormal beating of the heart that may be perceived by the patient, a result of excitement, exertion, or illness. quotations examples
Sometimes my pulse beat so quickly and hardly, that I felt the palpitation of every artery; at others, I nearly sank to the ground through languor and extreme weakness.
1818, [Mary Shelley], chapter IV, in Frankenstein; or, The Modern Prometheus. […], volume I, London: […] [Macdonald and Son] for Lackington, Hughes, Harding, Mavor, & Jones, pages 101–102