[Joe English] tells us, "If you want the system native [text] [font] (which is what the [entry], [listbox], and a handful of others use) by default, then: 
    [text .t -font TkTextFont]     
If you want the system-native "UI" font (used by [button]s, [menu]s, [checkbox]es, and most other UI elements): '''TkDefaultFont'''."

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