Fromtin +‎plate.

tinplate (countable anduncountable,pluraltinplates)

1. Alternative spelling oftin plate
   • 1961 August, “New traffic flows in South Wales”, inTrains Illustrated, page493:

     [...] 4,000 tons of slabs will be sent to the R.T.B. works at Ebbw Vale and a further 8,000 a week will be rolled at the new R.T.B. Newport Works and returned to the Steel Co. of Wales at Trostre and Llangyfelach in coil form for processing intotinplate.

tinplate (third-person singular simple presenttinplates,present participletinplating,simple past and past participletinplated)

1. Alternative spelling oftin-plate

• “tinplate”, inLexico,Dictionary.com;Oxford University Press,2019–2022.

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