-sided          
suffix uk/ -saɪ.dɪd/ us/ -saɪ.dɪd/
 …边的,面的
having the number of sides mentioned
  A square is a four-sided figure.
 a many-sided question 一个多方面的问题 
  与形容词联用,形容某物的边、面
used with adjectives to describe the type of sides something has
  a steep-sided hill 陡峭的山丘 
 The glass-sided classrooms proved noisy and impractical and had to be modified.
 See: side
 - More examples
 - The 12-sided fort would have been a powerful deterrent to any invading force.
 - The road emerges from among steep-sided hills.
 - There was a narrow-sided valley where the plane had vanished.