Wiktionary
n. (context physics English) an idealized solid whose size and shape are fixed and remain unaltered when forces are applied; used in Newtonian mechanics to model real objects
Wikipedia
]] In physics, a rigid body is an idealization of a solid body in which deformation is neglected. In other words, the distance between any two given points of a rigid body remains constant in time regardless of external forces exerted on it. Even though such an object cannot physically exist due to relativity, objects can normally be assumed to be perfectly rigid if they are not moving near the speed of light.
In classical mechanics a rigid body is usually considered as a continuous mass distribution, while in quantum mechanics a rigid body is usually thought of as a collection of point masses. For instance, in quantum mechanics molecules (consisting of the point masses: electrons and nuclei) are often seen as rigid bodies (see classification of molecules as rigid rotors).
Usage examples of "rigid body".
As a result, the two men proceeded down the street, bearing with them the rigid body of a wooden Indian.
Monty picked up the rigid body in his arms and went out without another word, and she stayed behind to straighten the sheets and coverlet.
Nothing in all this morning's investigations, not even the rigid body beneath the sheet, nor the strange discovery of the jewels, had so impressed Ricardo.
Her glance fell on Ambalasei's rigid body for a moment, hesitated, moved on.
His free hand, at the base of her spine, rocked her rhythmically against him, sending ripples of pure ecstasy through his rigid body.
They passed and re-passed, she with rigid body, her chin bent down, and he always in the same pose, his figure curved, his elbow rounded, his chin thrown forward.
With the piggies' help he lifted Miro to the top and let his rigid body drop into the waiting arms of the Bishop, the Mayor, Dom Cristã.