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Sheet iron or steel plated with an alloy of three or four parts of lead to one part of tin, used as a roofing material.
[Probably French terne, dull (from Old French; see tarnish) + plate.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
steel plate coated with terne metal.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.