Math. [f. CENTRE (or its source) + -OID.]

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  1.  = CENTRODE. [In this sense introduced by Prof. A. B. W. Kennedy, 1876, on the analogy of cycloid and other names of curves, but subsequently abandoned for centrode.]

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1876.  A. B. W. Kennedy, trans. Reuleaux’s Theoret. Kinemat.

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1876.  S. Kens. Mus. Catal., No. 563. Sinoidic cams. Cardioids. With second disc and centroid.

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1884.  Athenæum, 13 Sept., 339/2. The author erroneously calls the loci of the instantaneous centre ‘centroids,’ a term which has become appropriated in a very different sense.

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1886.  A. B. W. Kennedy, Mech. of Machin., 49 (note).

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  2.  Center of mass, or of gravity.

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1882.  Minchin, Unipl. Kinemat., 96. To find … the position of the Centroid (‘centre of gravity’) of any plane area.

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