a form symmetrical about a plane dividing it into two pyramids.
a geometrical form consisting of two pyramids with a common polygonal base


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    the fourth power. noun (maths) the fourth power

  • Biquadratic

    involving the fourth, but no higher, power of the unknown or variable. quartic (def 2). biquadrate. Historical Examples Chambers’s Twentieth Century Dictionary (part 1 of 4: A-D) Various Outlines of Educational Doctrine John Frederick Herbart Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 7 Various adjective of or relating to the fourth power noun a biquadratic […]

  • Biquarterly

    occurring twice in each quarter of a year. adjective occurring twice every three months

  • Biracial

    consisting of, representing, or combining members of two separate racial groups: a biracial committee on neighborhood problems. having a biological mother from one racial group and a biological father from another: She’s proudly biracial. Contemporary Examples The Mayors Who Can Revive America Tina Brown September 19, 2010 Behind Obama’s Tribute to the Aurora Victims’ Courage, […]

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