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The Collaborative International Dictionary
Cardioid

Cardioid \Car"di*oid\, n. [Gr. kardio-eidh`s heart-shaped; kardi`a heart + e'i^dos shape.] (Math.) An algebraic curve, so called from its resemblance to a heart.

Wiktionary
cardioid

a. Having this characteristic shape n. (context geometry English) An epicycloid with exactly one cusp; the plane curve with polar equation rho = 1 + cos,theta - having a shape supposedly heart-shaped

WordNet
cardioid

n. an epicycloid in which the rolling circle equals the fixed circle

Wikipedia
Cardioid

A cardioid (from the Greek καρδία "heart") is a plane curve traced by a point on the perimeter of a circle that is rolling around a fixed circle of the same radius. It is therefore a type of limaçon and can also be defined as an epicycloid having a single cusp. It is also a type of sinusoidal spiral, and an inverse curve of the parabola with the focus as the center of inversion.

The name was coined by de Castillon in 1741 but had been the subject of study decades beforehand. Named for its heart-like form, it is shaped more like the outline of the cross section of a round apple without the stalk.

A cardioid microphone exhibits an acoustic pickup pattern that, when graphed in two dimensions, resembles a cardioid, (any 2d plane containing the 3d straight line of the microphone body.) In three dimensions, the cardioid is shaped like an apple centred on the microphone which is the "stalk" of the apple.

Usage examples of "cardioid".

He dropped to his knees and inventoried the canvas bag, which contained everything an astute documentarian ought to have: the Betacam, the Ampex deck, the Nicad battery pack, two extra cassettes, a cardioid mike with sponge wind guard, steno notebook, pens.

A piece of cheese, with one of those built-in cardioid mikes, but it was adequate for spoken-word, ideal for oral history.

Rosette and seahorse and seething cloud, nebulosities on the brink of determinate form, cardioid traceries of the heart the patterns wrapped around him until he became a fractal tapestry, alive, every element in constant motion.

He dropped to his knees and inventoried the canvas bag, which contained every­thing an astute documentarian ought to have: the Betacam, the Ampex deck, the Nicad battery pack, two extra cassettes, a cardioid mike with sponge wind guard, steno notebook, pens.