How to Say "curtain wall" in Spanish
The Spanish word for “curtain wall” is “lienzo” — C1 level.
English → SpanishC1
nounC1formal
fortress or castle walls

Examples
El lienzo de la muralla norte necesita reparaciones.
The stretch of the north wall needs repairs.
Se puede ver un largo lienzo de piedra que rodea el castillo.
A long stone curtain wall can be seen surrounding the castle.
Este lienzo de pared es el más antiguo de la catedral.
This section of wall is the oldest in the cathedral.
Specific context
This meaning is almost exclusively used when talking about large, old stone walls or fortifications, not your living room wall.
Don't use for small walls
Mistake: “El lienzo de mi habitación es azul.”
Correction: Use 'la pared' for normal walls inside a house.
Related Translations
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