Definition of cardioid in English:

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Pronunciation: /ˈkɑːdɪɔɪd/


Image of cardioid
1A heart-shaped curve traced by a point on the circumference of a circle as it rolls around another identical circle.
Example sentences
  • M is the point of the moving circle that traces the cardioid.
  • The caustic of a circle with radiant point on the circumference is a cardioid, while if the rays are parallel then the caustic is a nephroid.
  • For the special case of b = a, the result is a two-dimensional heart-shaped curve known as the cardioid.
1.1 (also cardioid microphone) A directional microphone with a heart-shaped pattern of sensitivity.
Example sentences
  • These microphones are invariably cardioid microphones, meaning that the shape of the sound sensitive field around the mike is in the shape of a heart, essentially picking up sound in both forward and side directions.
  • DPA calls this mic a wide cardioid, and, indeed, between 500 Hz and 10k Hz, the 4015's polar response begins to resemble an omni mic.
  • For the upright, I used two mics: one cardioid large-diaphragm near the floor, pointing up at the bridge, and the xt up closer to the players' right hand to capture more of the string noise and attack.


Of the shape of a cardioid.
Example sentences
  • A similar procedure can be used for the intersection points on the cardioid shape and the outer green fringes.
  • His first two papers are on the cardioid curve which he named.


Mid 18th century: from Greek kardioeidēs 'heart-shaped', from kardia 'heart' + eidos 'form'.

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Line breaks: car¦di|oid

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