paraformaldehyde /ˌpærəfɔːˈmældɪˌhaɪd/ (also paraform)

• 1. 

  N a white amorphous solid polymeric form of formaldehyde: used as a convenient source of formaldehyde and as a fumigant. Formula: (CH2O)n, where n lies between 6 and 50 多聚甲醛