HyperDic

English > 1 sense of the word *cardioid*:
NOUN	shape	cardioid	an epicycloid in which the rolling circle equals the fixed circle

English > *cardioid*: 1 sense > noun 1, shape
Meaning	An epicycloid in which the rolling circle equals the fixed circle.
Broader	epicycloid	A line generated by a point on a circle rolling around another circle