a parallelogram with adjacent sides of unequal lengths; an oblique-angled parallelogram with only the opposite sides equal 
                                                            
                                                     
                        
                                                
                        
                        
                            shaped like a rhombus or rhomboid; "rhomboidal shapes" 
                                                            
                                                     
                        
                                                
                        
                        
                            Greek rhombus = a figure with 4 equal sides, not at right angles, and eidos = shape or form, hence, the shape of a rhombus.
                                                            
                                                     
                        
                                                
                        
                        
                            A rhomboid is a parallelogram with oblique angles and adjacent sides have different lengths.
                                                            
                                                     
                        
                                                
                        
                        
                            The shape of a diamond in a pack of cards.