Definition of cardioid in English:

cardioid

Line breaks: car¦di|oid
Pronunciation: /ˈkɑːdɪɔɪd
 
/

noun

Mathematics
1A heart-shaped curve traced by a point on the circumference of a circle as it rolls around another identical circle.
More 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.
More 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.

adjective

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Of the shape of a cardioid.
More 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.

Origin

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

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Pronunciation: ˈapəzit
adjective
apt in the circumstances or relation to something