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).

1745–55; < Greek kardioeidḗs heart-shaped. See cardi-, -oid Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
cardioid (ˈkɑːdɪˌɔɪd)
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 10th Edition
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American Heritage
Science Dictionary
cardioid   (kär'dē-oid')  Pronunciation Key 
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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
It is preferable to use a cardioid condenser rather than a paraboloid condenser for darkfield fluorescent microscopy.
The microphones are typically cardioid or super cardioid microphones and therefore the best quality signal for each speaker.
Slightly higher power levels may be allowed in certain cases when cardioid antennas are utilized.
The cardioid, for instance, features a partially closed backside.
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