a. [f. TESSERA + -AL.]

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  1.  Of, pertaining to, or resembling a tessera or tesseræ; composed of tessera.

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1846.  Worcester cites Edinb. Rev.

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  2.  Cryst. = ISOMETRIC 3, CUBIC a. 1 c.

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1854.  Pereira’s Pol. Light, 191. The cubic or octohedral system. Synonymes.—The regular, the tessular, the tesseral, or the isometric system.

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1878.  Gurney, Crystallogr., 37. Crystals possessing this highest possible degree of symmetry are said to belong to the Cubic or Tesseral System.

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  3.  Math. Relating to the tesseræ of a spherical surface (see TESSERA 2 b), as in tesseral harmonic, a spherical surface harmonic which is the product of two factors depending respectively on latitude and longitude.

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1873.  Maxwell, Electr. & Magn. (1881), I. 196. We may now write the expressions for the two tesseral harmonics. Ibid., 198. To find the surface integral of the square of any tesseral harmonic taken over the sphere.

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1887.  Hobson, in Trans. Camb. Philos. Soc. (1889), XIV. 211. The zonal and tesseral harmonics … are exhibited as series.

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