Etymology
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cambium (n.)

1670s in botany, "layer of tissue between the wood and the bark," from Late Latin cambium "exchange," from Latin cambiare "change" (see change (v.)).

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Definitions of cambium

cambium (n.)
a formative one-cell layer of tissue between xylem and phloem in most vascular plants that is responsible for secondary growth;
cambium (n.)
the inner layer of the periosteum;
From wordnet.princeton.edu