Here you will find one or more explanations in English for the word Rewel bone.
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Rewel bone
Rewel bone Rew"el bone` [Perh. from F. rouelle, dim. of roue a
wheel, L. rota.]
An obsolete phrase of disputed meaning, -- perhaps, smooth or
polished bone.
His saddle was of rewel boon. --Chaucer.
Meaning of Rewel bone from wikipedia