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cardioid

[kahr-dee-oid]

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).

Origin:
1745–55; < Greek kardioeidḗs heart-shaped. See cardi-, -oid

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Link To cardioid

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Cardioid is always a great word to know.

So is infinity. Does it mean:

the assumed limit of a sequence or series that increases without bound; infinite distance

one of several highly systematic methods of treating problems by a special system of algebraic notations, such as differential or integral calculus

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Collins

World English Dictionary

cardioid (ˈkɑːdɪˌɔɪd)

—n
	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
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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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.

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cardioid

car·di·oid