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

Derived forms: square millimeters

Type of: area unit, square measure

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

Encyclopedia: Square millimeter