Designed or constructed to withstand shellfire.(adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "shellproof" in a sentence
"We have to question the judgement of UN officials who allowed children onto a site which wasn't even shellproof, and then failed to stop Hamas from launching mortars from the school grounds."
"A shellproof flat roof, of perforated plate iron, placed on forged beams, inserted six inches down the cylinder, covers the top."