subfolder

noun
sub·​fold·​er | \ ˈsəb-ˌfōl-dər How to pronounce subfolder (audio) \
variants: or less commonly sub-folder
plural subfolders also sub-folders

Definition of subfolder

: an organizational folder on a computer that is located within another folder … employed a zealous manager … who maintained the computer's files in a meticulous network of folders and subfolders that neatly laid out the group's organizational structure and strategic concerns.— Alan Cullison

First Known Use of subfolder

1975, in the meaning defined above

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