Webster's English Dictionary

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cambium

cam.bi.um \-be--*m\ \-be--*\ n or cambiums or cam.bia [NL, fr. ML, 
   exchange, fr. L cambiare to exchange] pl  : a thin formative layer between 
   the xylem and phloem of most vascular pla nts that gives rise to new cells 
   and is responsible for secondary growth