gyrostat

[jahy-ruh-stat]

noun

a modified gyroscope, consisting of a rotating wheel pivoted within a rigid case.

Origin of gyrostat

First recorded in 1875–80; gyro- + -stat

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

But now remove the gyrostat from the frame, and set the wheel in rotation.
Lord Kelvin
Andrew Gray
There is, however, a great difference between the earth and the gyrostat.
Spinning Tops
John Perry
Here is a gyrostat (Fig. 23) something like the earth in shape, and it is at rest.
Spinning Tops
John Perry
It is not precessing, so you know that the weight W just balances the gyrostat F.
Spinning Tops
John Perry
Now close observation will give you a simple rule about the behaviour of a gyrostat.
Spinning Tops
John Perry

1879, from gyro- + Greek statos "placed, standing," from PIE root *sta- (see stet).