cardioid

[ kahr-dee-oid ]

/ ˈkɑr diˌɔɪd /

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noun Mathematics.

a somewhat heart-shaped curve, being the path of a point on a circle that rolls externally, without slipping, on another equal circle. Equation: r = a(1−cosA).

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Origin of cardioid

First recorded in 1745–55, cardioid is from the Greek word kardioeidḗs heart-shaped. See cardi-, -oid

Words nearby cardioid

cardiodynia, cardiogenic, cardiogenic shock, cardiogram, cardiograph, cardioid, cardiolipin, cardiology, cardiomegaly, cardiomyopathy, cardiopathy

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use cardioid in a sentence

The name cardioid stems from the heart-like shape you see in a diagram of its polar pattern.
The shape of things to come: Different types of microphones and when to use them|Mike Levine|August 26, 2021|Popular-Science
Engineers often choose hypercardioid or supercardioid mics when even a cardioid mic is getting too much bleed from other sources.
The shape of things to come: Different types of microphones and when to use them|Mike Levine|August 26, 2021|Popular-Science
Supercardioid mics are more focused on the front than cardioid mics but have a small lobe that picks up from the back but at a much lower level.
The shape of things to come: Different types of microphones and when to use them|Mike Levine|August 26, 2021|Popular-Science
They often have a cardioid polar pattern that does an excellent job rejecting background noise, which is why they commonly turn up in the hands of stage performers and field reporters.
The best mic for streaming in 2021|Tony Ware|August 25, 2021|Popular-Science

Undoubtedly the best studio microphone of our choices, it handles high volumes across a wide frequency range without distortion and its cardioid polar pattern keeps your voice front-and-center in the mix while rejecting surrounding chatter.
The best mic for streaming in 2021|Tony Ware|August 25, 2021|Popular-Science

British Dictionary definitions for cardioid

cardioid

/ (ˈkɑːdɪˌɔɪd) /

noun

a heart-shaped curve generated by a fixed point on a circle as it rolls around another fixed circle of equal radius, a. Equation: r = a (1 – cos φ), where r is the radius vector and φ is the polar angle

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for cardioid

cardioid

[ kär′dē-oid′ ]

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.