·adj ·same·as Rhomboidal.
II. Rhomboid ·noun An oblique-angled parallelogram like a rhomb, but having only the opposite sides equal, the length and with being different.
An oblique parallelogram, having its opposite sides equal and parallel, but its angles not right ang...
The Sailor's Word-Book
·adj Between rhomboid and ovate, or oval, in shape. ...
Webster's Dictionary of the English Language