Definition of ferrous adjective from the Oxford Advanced Learner's Dictionary

 

ferrous

 adjective
adjective
BrE BrE//ˈferəs//
 
; NAmE NAmE//ˈferəs//
 
[only before noun](specialist)
 
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containing iron; connected with iron ferrous and non-ferrous metals Word Origin mid 19th cent.: from Latin ferrum ‘iron’ + -ous.
See the Oxford Advanced American Dictionary entry: ferrous