hygienics/hieʹjeeniks/ pl noun

• double feature
• double figures
• double first
• double flat
• double glazing
• Double Gloucester
• doubleheader
• double helix
• double indemnity
• double jeopardy
• double-jointed
• double knitting
• double negative
• double obelisk
• double-park
• double pneumonia
• double-quick
• double reed
• double refraction
• doubles
• double salt
• double saucepan
• double sharp
• double-space
• doublespeak