noun (n)

• rotating mechanism in the form of a universally mounted spinning wheel that offers resistance to turns in any direction

  penggiliran mekanisme dalam bentuk universal dilekapkan roda berputar yang menawarkan rintangan untuk berubah ke arah manapun

  Synonym:
  gyro
  

  source: wordnet30
• A rotating wheel, mounted in a ring or rings, for illustrating the dynamics of rotating bodies, the composition of rotations, etc. It was devised by Professor W. R. Johnson, in 1832, by whom it was called the rotascope.

  NA

  source: webster1913