car·​di·​oid ˈkär-dē-ˌȯid How to pronounce cardioid (audio)
: a heart-shaped curve that is traced by a point on the circumference of a circle rolling completely around an equal fixed circle and has an equation in one of the forms ρ = a(1 ± cos θ) or ρ = a(1 ± sin θ) in polar coordinates

Illustration of cardioid

Illustration of cardioid
  • ABP fixed circle; PCD first position of rolling circle; P tracing point; PM diameter through P; P1
  • P2
  • P3
  • P4 various positions of P; P1M1
  • P2M2
  • P3M3
  • P4M4 various positions of PM

Example Sentences

Recent Examples on the Web The donation by Audio-Technica is a fitting one as the AT2020 cardioid condenser was the first side-address microphone that was priced less than £100/€100 and provided professional-quality sound. Mark Sparrow, Forbes, 20 Oct. 2021 The cells stay behind on the cardioid, which then starts to recover. Theresa Machemer, Smithsonian Magazine, 20 May 2021 The Yeti can record in four different modes: cardioid, omni, bidirectional, and stereo. Popular Science, 21 Jan. 2020 The Yeti Nano has two recording patterns: cardioid (for capturing a source talking directly into the mic) and omnidirectional (for capturing audio in a small area around the mic). Jeff Dunn, Ars Technica, 19 Nov. 2018 This compact cardioid condenser mic jacks into the phone via a Lightning dongle to bring your sparkling dialog into focus. Arielle Pardes, WIRED, 1 July 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'cardioid.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

Word History

First Known Use

1747, in the meaning defined above

Time Traveler
The first known use of cardioid was in 1747

Dictionary Entries Near cardioid

Cite this Entry

“Cardioid.” Dictionary, Merriam-Webster, Accessed 31 Jan. 2023.

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