cardioid means having this characteristic shape. It carries an Arena rating of 1527, earned across 2 head-to-head judged battles.
Among words judged in Lexicurio's Arena, cardioid ranks #3,343 of 17,127 for Most Vivid Words, #3,632 of 17,124 for Most Sublime Words, #4,088 of 17,149 for Most Exacting Words, #4,235 of 17,143 for Best Fossil-Poetry Words.
Why “cardioid” is a great word
A heart-shaped plane curve traced by a point on a circle rolling around another circle of equal radius, described by the polar equation ρ = a(1 + cos θ). From the Greek kardioeidḗs ("heart-shaped"), from kardía ("heart") + -oeidēs ("-oid, having the form of"). First recorded in English 1745–55. Unlike an "epicycloid," a general family of rolling curves, or "omnidirectional," denoting uniform sensitivity from all around, the cardioid is a specific, front-facing symmetry. It is the perfect caustic of light in a coffee cup, the precise footprint of a perfect whisper in a microphone, the geometric ghost left by one rolling wheel upon its twin—a shape of singular focus, born from perfect parity and always open on one side, a cold equation that describes the body's own center.
Etymology
By surface analysis, cardi- + -oid.
adj
- Having this characteristic shape
- sensitive in front, but not behind or at the sides
noun
- An epicycloid with exactly one cusp; the plane curve with polar equation ρ=1+ cos ,θ - approximately heart-shaped
Definitions & examples from Wiktionary (CC BY-SA 3.0).
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