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plural cambiums or cambia
(botany) A layer of cells between the xylem and the phloem that is responsible for the secondary growth of roots and stems. quotations examples
During winter we perceive no change in the cells of the cambium layer, which are filled with nutritive matter […].
1863, Harland Coultas, What may be learned from a tree
(anatomy) Periosteum, a membrane that covers the outer surface of bones examples
(obsolete) One of the humours formerly believed to nourish the bodily organs. quotations
The radical or innate is daily supplied by nourishment, which some call cambium, and make those secondary humours of ros and gluten to maintain it […].
1624, Democritus Junior [pseudonym; Robert Burton], The Anatomy of Melancholy: […], 2nd edition, Oxford, Oxfordshire: Printed by John Lichfield and James Short, for Henry Cripps