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*noun:*- A heart-shaped jet curve, the locus of a fixed point on a circle that rolls on the circumference of some other circle with the exact same radius.

- An epicycloid with precisely one cusp; the airplane curve with polar equation - having a shape supposedly heart-shaped
- An algebraic curve, so named from its similarity to a heart.
- A curve that might be considered as the road of a point regarding the circumference of a circle which rolls on another group of equal size.
- an epicycloid where the rolling circle equals the fixed circle

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*adjective:*- Having this characteristic form

*others:*- Resembling or having the figures of this Cardiidæ.

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**Definition for "cardioid"**- A heart-shaped jet curve, the locus of a…
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## How would you define cardioid?