goniometer

/G OW0 N IY0 AA1 M AH0 T ER0/
noun
  1. 1

    A device used to measure the angles of joints commonly used in orthopedics and physical therapy.

  2. 2

    A device used to measure the angles of crystals.

  3. 3

    A radio direction finder.

  4. 4

    An arthrometer (device for measuring the arc or range of mobility of a joint).

Source: https://en.wiktionary.org/wiki/goniometer