instantaneous axis

instantaneous axis

[¦in·stən¦tā·nē·əs ′ak·səs]
(mechanics)
The axis about which a rigid body is carrying out a pure rotation at a given instant in time.
References in periodicals archive ?
The controlled mobility of the Mobi-C's mobile insert encourages restoration and respect of the instantaneous axis of rotation for a return to physiological mobility of the inter-vertebral disc and the cervical spine.

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