Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of cardioid is as below...

Trochoid :: Trochoid (n.) The curve described by any point in a wheel rolling on a line; a cycloid; a roulette; in general, the curve described by any point fixedly connected with a moving curve while the moving curve rolls without slipping on a second fixed curve, the curves all being in one plane. Cycloids, epicycloids, hypocycloids, cardioids, etc., are all trochoids..

Cardioid :: Cardioid (n.) An algebraic curve, so called from its resemblance to a heart..

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