Longman Dictionary of Contemporary English
Wiktionary
excluder
n. Something which excludes
Wikipedia
Usage examples of "excluder".
They didn't say through gritted-together teeth: ``If you do that again I'll cut your bollocks off and nail them to the letter box as a draught excluder!
They'd agreed to the idea of a Royal Society for the Betterment of Mankind, but since this largely consisted of as much time as Shawn Ogg had to spare on Thursday afternoons Mankind was safe from too much Betterment for a while, although Shawn had invented draught excluders for some of the windier parts of the castle, for which the King had awarded him a small medal.