Definition of transition metal noun from the Oxford Advanced Learner's Dictionary

 

transition metal

 noun
noun
BrE
 
; NAmE
 
(also transition element)(chemistry)
 
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one of the group of metals in the centre of the periodic table (= a list of all the chemical elements) which form coloured compounds and often act as catalysts (= substances that make chemical reactions happen faster)
See the Oxford Advanced American Dictionary entry: transition metal