• IPA: /ˈtɹʌn.jən/

trunnion (plural trunnions)

  1. One of the short stubby bearings on either side of a cannon; a gudgeon.
  2. A similar rotational bearing comprising a rotating arc or ring sliding in the groove of a stationary arc, used in machinery to allow a workpiece to be moved relative to a fixed tool.
  3. A similar rotational bearing used in automotive suspensions.

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