| 单词 | cardioid |
| 释义 | cardioid /kahr"dee oyd'/, n. Math. a somewhat heart-shaped curve, being the path of a point on a circle that rolls externally, without slipping, on another equal circle. Equation: r = a (1-cosA). [1745-55; < Gk kardioeidés heart-shaped. See CARDI-, -OID] |
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