Cam"bi*um (?), n. [LL. cambium exchange, fr. L. cambire to exchange. It was supposed that cambium was sap changing into wood.]
A series of formative cells lying outside of the wood proper and inside of the inner bark. The growth of new wood takes place in the cambium, which is very soft.
A fancied nutritive juice, formerly supposed to orgiginate in the blood, to repair losses of the system, and to promote its increase.
© Webster 1913.