sideside /saɪd/ noun 
► side
► side a part of something that is not the front, back, top, or bottom: Your ears are on the side of your head. One of the windows on the side of the house is broken. ➔ Side can also mean one of the flat parts on the outside of something, even if the flat part is the front or back of the object: Sean wrote “Do not drop” on the side of the box.
► face a side of a mountain, cliff, or tall building: They climbed up the north face of the mountain.
► surface one of the sides of an object that has many sides, including the top, bottom, back, and front: “How many surfaces does a cube have?” “Six.”
➔ see edge