rhom·boid /ˈrɑmˌbɔɪd/
  偏菱形,長斜方形(a.)長斜方形的
  Rhom·boid n.  Geom. An oblique-angled parallelogram like a rhomb, but having only the opposite sides equal, the length and with being different.
  Rhom·boid a. Same as Rhomboidal.
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  rhomboid
       adj : shaped like a rhombus or rhomboid; "rhomboidal shapes" [syn:
              rhomboidal]
       n 1: a parallelogram with adjacent sides of unequal lengths; an
            oblique-angled parallelogram with only the opposite
            sides equal
       2: any of several muscles of the upper back that help move the
          shoulder blade [syn: rhomboid muscle]