cambium
CAMBIUM, PLURAL CAMBIUMS, OR CAMBIA, IN PLANTS, LAYER OF ACTIVELY DIVIDING CELLS BETWEEN XYLEM (WOOD) AND PHLOEM (BAST) TISSUES THAT IS RESPONSIBLE FOR THE SECONDARY GROWTH OF STEMS AND ROOTS.
Cambium (botany); Cambian; Cambial
['kamb??m]
¦ noun (plural cambia or cambiums) Botany a cellular plant tissue from which phloem, xylem, or cork grows by division.
Derivatives
cambial adjective
Origin
C16 (denoting one of the alimentary humours once supposed to nourish the body): from med. L., 'change, exchange'.