1. A highly toxic chemical used to engrave metal plates and electronic circuits

Type of: perchloride

• formal semantics
• formaldehyde
• formalin
• formalisation
• formalise
• formalised
• formalism
• formalist
• formalistic
• formalities
• formality
• formalization
• formalize
• formalized
• formally
• formalness
• formalwear
• format
• sense of balance
• sense of direction
• sense of duty
• sense of equilibrium
• sense of hearing
• sense of humor
• sense of humour