noun Medicine/Medical.
excessively rapid heartbeat.

1885–90; tachy- + -cardia

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World English Dictionary
tachycardia (ˌtækɪˈkɑːdɪə)
pathol Compare bradycardia abnormally rapid beating of the heart, esp over 100 beats per minute

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American Heritage
Medical Dictionary

tachycardia tach·y·car·di·a (tāk'ĭ-kär'dē-ə)
A rapid heart rate, especially one above 100 beats per minute in an adult. Also called tachyrhythmia.

The American Heritage® Stedman's Medical Dictionary
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Example sentences
He was in tachycardia with plummeting blood pressure.
The postural tachycardia syndrome a brief review of etiology, diagnosis and treatment.
Obtain history of the duration of the current episode of tachycardia, if known.
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