单词 | focaloid |
释义 | focaloid Math.|ˈfəʊkəlɔɪd| [f. as prec. + -oid.] A shell, in general indefinitely thin, bounded by two confocal ellipsoidal surfaces.
1879Thomson & Tait Nat. Phil. §494 The attraction of a homogeneous solid ellipsoid is the same through all external space as the attraction of a homogeneous focaloid of equal mass coinciding with its surface. |

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