plural panini or paninis
Definition of panini
: a usually grilled sandwich made with Italian bread
Note: Panini is a plural form in Italian but is commonly used as both a singular and a plural in English. Its use as a singular has given rise the variant plural form paninis. The use of panino as a singular form in English has become relatively uncommon as panini has become established as the usual singular.
On each visit, someone at our table invariably orders a panini …— Jodi Wright At the back of the shop are paninis, freshly brewed coffee and two tubs of homemade soups.— M. H. Reed
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Merriam-Webster unabridged
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Time Traveler for panini
The first known use of panini was in 1955
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