| Noun | 1. | sideboard - a removable board fitted on the side of a wagon to increase its capacity board - a flat piece of material designed for a special purpose; "he nailed boards across the windows" |
| 2. | sideboard - a board that forms part of the side of a bed or crib board - a flat piece of material designed for a special purpose; "he nailed boards across the windows" | |
| 3. | sideboard - a piece of furniture that stands at the side of a dining room; has shelves and drawersdining room, dining-room - a room used for dining drawer - a boxlike container in a piece of furniture; made so as to slide in and out article of furniture, furniture, piece of furniture - furnishings that make a room or other area ready for occupancy; "they had too much furniture for the small apartment"; "there was only one piece of furniture in the room" shelf - a support that consists of a horizontal surface for holding objects |