Proto-Indo-European root meaning "door, doorway." The base form is frequently in dual or plural, leading to speculation that houses of the original Indo-Europeans had doors with two swinging halves.
It forms all or part of: afforest; deforest; door; faubourg; foreclose; foreign; forensic; forest; forfeit; forum; hors d'oeuvre; thyroid.
It is the hypothetical source of/evidence for its existence is provided by: Sanskrit dvárah "door, gate;" Old Persian duvara- "door;" Greek thyra "door;" Latin foris "out-of-doors, outside;" Gaulish doro "mouth;" Old Prussian dwaris "gate;" Russian dver' "a door;" Old English dor, German Tür "door," Gothic dauro "gate."
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