frustrum:      -^

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    Well, here you go:

    athena% oed frustrum
    frustrum
    Pl. -a, -ums. Also erron. 7-9 frustrum. 
    1. Math. The portion of a regular solid left after cutting off the
    upper part by a plane parallel to the base; or the portion intercepted
    between two planes, either parallel or inclined to each other.
    b. Applied to the sections of the shaft of a column.
    2. gen. A portion or fragment of anything material or immaterial.
    rare.

    athena% webster frustrum
    No definition for 'frustrum'.  Maybe you mean:
    1. frustum             

    athena% webster frustum
    frus.tum \'fr*s-t*m\ \-t*\ n or frustums or frus.ta [NL, fr. L, piece, bit 
    - more at BRUISE] pl  : the part of a cone-shaped solid next to the base 
    and formed by cutting off the top by a plane parallel to the base; also : 
    the part of a solid intersected between two usu. parallel planes
   
    athena% oed frustum
    frustum
    1. Math. The portion of a regular solid left after cutting off the
    upper part by a plane parallel to the base; or the portion intercepted
    between two planes, either parallel or inclined to each other.
    b. Applied to the sections of the shaft of a column.
    2. gen. A portion or fragment of anything material or immaterial.
    rare.


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