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It also includes an additional noun meaning related to fencing, plus a medical definition focused on thin metal used to fill teeth. References and origin notes accompany each sense.",{"@graph":69,"@context":118},[70,84,105],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":15,"@type":76,"position":81},"https://docshare.wps.com/document/literature/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/foil-definition-and-more-from-the-free-merriam-webster-dictionary/429853/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/foil-definition-and-more-from-the-free-merriam-webster-dictionary/429853.png","ImageObject",300,407,{"name":92,"@type":93},"Blue Pony","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-30","2026-09-29",true,{"@type":102,"interactionType":103,"userInteractionCount":29},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114],{"name":109,"@type":110,"acceptedAnswer":111},"What are the main verb meanings of “foil” in the entry?","Question",{"text":112,"@type":113},"“Foil” is used as a verb meaning to prevent attaining an end, i.e., to defeat or thwart, with example phrasing like “foiled the plot” and “foil her enemies.”","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"How does the entry describe “foil” in fencing and in medical usage?",{"text":117,"@type":113},"In fencing, “foil” is a light fencing sword and refers to the sport/art of fencing with the foil. In medical usage, “foil” is defined as very thin sheet metal used especially for filling teeth.","https://schema.org",{"og:url":83,"og:type":120,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":122,"canonical":83},"index,follow",{"doc_id":124,"site_id":62},429853,1791139193,{"code":4,"msg":5,"data":127},{"doc_id":124,"user_id":128,"nickname":92,"user_avatar":129,"doc_module":4,"category_id":14,"category_name":15,"doc_title":65,"doc_description":67,"doc_content":130,"file_id":131,"file_url":132,"file_type":133,"file_size":134,"view_count":29,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":19,"language":135,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":136,"faqs":137,"seo_title":138,"seo_description":67,"update_tm":139,"read_time":29},962090760266,"https://ap-avatar.wpscdn.com/davatar_276721f389ce27ea32af1340a28f341c","Foil - Definition and More from the Free Merriam-Webster Dictionary  \n11/3/14, 7:32 AM  \nTest Your Vocabulary Take Our 10-Question Quiz  \n\n| Quizzes & Games | Word of the Day | Video | New Words | My Favorites |\n| --- | --- | --- | --- | --- |\n\nNew!  \nSpanish Central   \nfoil  \nfoil  \n5 ENTRIES FOUND:  \nPopularity  \nfoil  \naluminum foil gold foil  \n1foil verb \\ˈfi(-ə)l\\  \nDefinition of FOIL  \ntransitive verb  \n1 obsolete : TRAMPLE  \n2 a : to prevent from attaining an end : DEFEAT \u003Calways able to foil her enemies>  \nb : to bring to naught : THWART \u003Cfoiled the plot>  \nName That Thing  \nTake our visual vocabulary quiz  \nTest Your Knowledge »  \nTrue or False?  \nA quick quiz about stuff worth knowing  \nTake It Now »  \nSpell It  \nThe commonly misspelled words quiz  \nHear It, Spell It »  \nWords for Uncommon Fears  \nTop 10 Unusual Phobias, Vol. 1  \n\"Machiavellianism\" and (AWhole Lot) More  \nTop 10 Unusually Long and Interesting Words  \nOrigin of FOIL  \nMiddle English, alteration of fullen to full cloth, from Anglo  \nFrench foller — more at FULL  \nFirst Known Use: 14th century  \n2foil noun  \nDefinition of FOIL  \n1 archaic : DEFEAT  \n2 archaic : the track or trail of an animal  \nFirst Known Use of FOIL  \n15th century  \nRhymes with FOIL  \nboil, broil, coil, moil, oil, royal, soil, spoil, toil  \n3foil noun  \nDefinition of FOIL  \n1 : very thin sheet metal \u003Caluminum foil >  \n[http://www. merriam-webster.com/dictionary/foil](http://www. merriam-webster.com/dictionary/foil) Page 1 of 4  \nFike Corporation IPR2015-00341  \nExhibit 1012-1  \nFoil - Definition and More from the Free Merriam-Webster Dictionary 11/3/14, 7:32 AM  \n2 : a thin piece of material (as metal) put under an inferior or paste stone to add color or brilliance  \n3 : someone or something that serves as a contrast to another \u003Cacted as a foil for a comedian>  \n4 a : an indentation between cusps in Gothic tracery  \nb : one of several arcs that enclose a complex figure  \n5 : HYDROFOIL 1  \nOrigin of FOIL  \nMiddle English, leaf, from Anglo-French fuille, foille (from  \nLatin folia, plural of folium) & fuil, from Latin folium — more  \nat BLADE  \nFirst Known Use: 14th century  \nOther Metals and Metallurgy Terms  \nassay, bloom, bullion, ductile, ingot, malleable, patina, plate,  \ntemper, tensile  \n4foil verb  \nDefinition of FOIL  \ntransitive verb  \n1 : to back or cover with foil  \n2 : to enhance by contrast  \nFirst Known Use of FOIL  \n1611  \n5foil noun  \nDefinition of FOIL  \n1 : a light fencing sword having a usually circular guard and a flexible blade of rectangular section tapering to a blunted point — compare ÉPÉE, SABER  \n2 : the art or sport of fencing with the foil —often used in plural  \nOrigin of FOIL  \norigin unknown  \nFirst Known Use: 1594  \nOther Combat Sports Terms  \nriposte, welter  \nfoil noun \\ˈfil\\ (Medical Dictionary)  \nMedical Definition of FOIL  \n: very thin sheet metal (as of gold or platinum) used  \n[http://www. merriam-webster.com/dictionary/foil](http://www. merriam-webster.com/dictionary/foil) Page 2 of 4  \nFike Corporation IPR2015-00341  \nExhibit 1012-2  \nFoil - Definition and More from the Free Merriam-Webster Dictionary 11/3/14, 7:32 AM  \n: very thin sheet metal (as of gold or platinum) used  \nespecially in filling teeth  \nLearn More About FOIL  \nThesaurus: All synonyms and antonyms for \"foil\"  \nSpanish Central: Spanish translation of \"foil\"  \nSCRABBLE® : Playable words you can make from \"foil\"[Britannica.com:](Britannica.com:) Encyclopedia article about \"foil\"  \nBrowse  \nNext Word in the Dictionary: foiled  \nPrevious Word in the Dictionary: foie gras  \nAll Words Near: foil  \nAsk The Editor Videos  \nOld-School Grammar Schwa  \n Seen & Heard   \nWhat made you want to look up foil? Please tell us where you read or heard it (including the quote, if possible) .  \nView Seen & Heard highlights from around the site »  \nMerriam-Webster on Facebook  \nThe Merriam-Webster Unabridged Dictionary  \nOnline access to a legendary resource Log In or Sign Up »  \n| Learning English?\u003Cbr>We","cbCaimjZfxfY6DRP","https://ap.wps.com/l/cbCaimjZfxfY6DRP","pdf",1697368,"English","# FOIL\n## Verb\n## Noun\n## Origin\n## Fencing (foil)\n## Medical definition","[{\"question\":\"What are the main verb meanings of “foil” in the entry?\",\"answer\":\"“Foil” is used as a verb meaning to prevent attaining an end, i.e., to defeat or thwart, with example phrasing like “foiled the plot” and “foil her enemies.”\"},{\"question\":\"How does the entry describe “foil” in fencing and in medical usage?\",\"answer\":\"In fencing, “foil” is a light fencing sword and refers to the sport/art of fencing with the foil. In medical usage, “foil” is defined as very thin sheet metal used especially for filling teeth.\"}]","Foil - Definition and More from the Free Merriam-Webster Dictionary | PDF",1790651359]