filename extension

Noun
  1. A string of characters beginning with a period and followed by one or more letters;
    The optional second part of a PC computer filename (synset 106346173)
    "most applications provide extensions for the files they create"; "most BASIC files use the filename extension .BAS"
    is a type of: string - a linear sequence (as of characters, words, proteins, etc.)
    is a part of: computer file name, computer filename, file name, filename - (computer science) the name given to a computer file in order to distinguish it from other files; may contain an extension that indicates the type of file
    same as: extension, file name extension

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