English dictionary
hypotrochoid
Definitions, examples, synonyms and antonyms from WordNet 3.0.
noun
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A curve, traced by a point in the radius, or radius produced, of a circle which rolls upon the concave side of a fixed circle. See <u>Hypocycloid</u>, <u>Epicycloid</u>, and <u>Trochoid</u>.
Source: webster1913