a. [f. prec. + -AL.]

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  1.  Geom. Having the form or nature of a trochoid; pertaining or relating to trochoids: see prec. A. 1.

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1799.  Young, in Phil. Trans., XC. 137. A similar chord bent into a trochoidal curve.

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1861.  W. Froude, Rolling of Ships (1862), 23. The wave would be more accurately represented by some member of the cycloidal or trochoidal family than by the curve of sines.

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  2.  Conch., = TROCHOID B. 2. rare–0.

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1891.  in Cent. Dict.

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  3.  Anat. = TROCHOID B. 3. rare.

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1882.  Ogilvie (Annandale), s.v. Trochoid, A trochoidal articulation.

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  Hence Trochoidally adv., in a trochoidal manner or course.

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1855.  De Morgan, in Graves, Life Sir W. R. Hamilton (1889), III. 519. A book … showing that the earth moves trochoidally if the sun has motion.

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