Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A heart-shaped plane curve, the locus of a fixed point on a circle that rolls on the circumference of another circle with the same radius.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. An epicycloid with exactly one cusp; the plane curve with polar equation - having a shape supposedly heart-shaped
  • adj. Having this characteristic shape

from the GNU version of the Collaborative International Dictionary of English

  • n. An algebraic curve, so called from its resemblance to a heart.

from The Century Dictionary and Cyclopedia

  • Resembling or having the characters of the Cardiidæ.
  • n. A curve which may be considered as the path of a point on the circumference of a circle which rolls on another circle of equal size.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. an epicycloid in which the rolling circle equals the fixed circle

Etymologies

cardio- + -oid (Wiktionary)

Examples

  • Do not use a omnidirectional mic or something like that, look up "cardioid" and make sure that's the type of mic you are using!

    All Updates @ Ultimate-Guitar.Com

  • † For my fellow audio engineering geeks out there, my brother held an Audio Technica Dual Reference cardioid mic directly at the sound hole on an X axis.

    Guitar Fridays: 1921 Martin 00-28

  • Tried the directional cardioid and the omnidirectional capsule settings, went with the omnidirectional.

    [film] Ask the Dust

  • A word of caution that it is quite sensitive and will pick up a lot of ambient noise, even using the cardioid capsule.

    That's what I want plugged into my Mac Mini!

  • Severing the cardioid arteries releases the pressure and drains blood from the brain.

    Asimov's Science Fiction

  • The image expanded; they were diving into the cleft between the main cardioid and its tangent circle.

    The Ghost from the Grand Banks

  • It has three capsules, with settings for stereo, cardioid, omnidirectional, and bidirectional recording; a built-in headphone amplifier for latency-free monitoring; and dials to control gain and headphone volume.

    Boing Boing

  • I was so fascinated by the shape and mathematical description of a simple curve (cardioid or cissoid per - haps) that I had stumbled across in my reading that again I could not rest until I had explored in depth as many curves as I could

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  • The Electro-Voice N/DYM® N/D267AS is a dynamic cardioid vocal microphone that offers clear, consistent sound without low-end distortion.

    Musician's Friend: Stupid Deal of the Day

  • The mic features a one-inch side-terminated cardioid capsule with an open airy top end response.

    MacMusic - News

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