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In page Symphytum:

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Folk medicine names for comfrey include knitbone, boneset, and the derivation of its Latin name Symphytum (from the Greek symphytis, meaning growing together of bones, and phyton, a plant[1][citation needed]), referring to its ancient uses. Similarly, the common French name is consoude, meaning to weld together. The tradition in different cultures and languages suggests a common belief in its usefulness for mending bones.