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Noun: square millimetre
Usage: Brit, Cdn (US: square millimeter)
  1. A unit of area measurement equivalent to 1 millimetre in length multiplied by 1 millimetre in width
    "The microscopic organism's size was measured in square millimetres";
    - square millimeter [US]

Derived forms: square millimetres

Type of: area unit, square measure

Part of: square centimeter [US], square centimetre [Brit, Cdn]

Encyclopedia: Square millimetre