
die Leinwand
screen
The large white surface in a cinema onto which films are projected.
Der Film kommt nächste Woche auf die große Leinwand.
The film comes to the big screen next week.
screen / canvas
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screen
The large white surface in a cinema onto which films are projected.
Der Film kommt nächste Woche auf die große Leinwand.
The film comes to the big screen next week.

canvas
A piece of sturdy fabric stretched over a frame, used by artists as a painting surface for paintings.
Der Maler trug mit einem breiten Pinsel die erste Farbschicht auf die leere Leinwand auf.
The painter applied the first layer of paint to the empty canvas with a broad brush.

canvas
A robust, sturdy fabric originally made from linen (flax) and used for sails, tents, or clothing.
Für das Zelt wurde eine wasserdichte Leinwand verwendet.
Waterproof canvas was used for the tent.
'Leinwand' consists of 'Lein' (linen, a fabric made from the flax plant) and 'Wand' (wall). Originally, then, it was a 'wall made of linen fabric.' This origin explains the different meanings, all of which have to do with a kind of fabric surface.
Früher wurden Segel für Schiffe aus robuster Leinwand gefertigt.
In the past, sails for ships were made from robust canvas.
The meaning of 'Leinwand' (screen/canvas) is usually clear from the context. Words like 'Kino' (cinema) or 'Film' (film/movie) point to the projection screen, 'Maler' (painter) or 'Farbe' (paint/color) to the painting surface, and 'Stoff' (fabric) or 'Zelt' (tent) to the material.
Der Künstler spannte eine neue Leinwand auf seinen Rahmen.
The artist stretched a new canvas onto his frame.
In a cinema context, 'Leinwand' (screen) is almost always used with the preposition 'auf' (on). Fixed expressions are 'ein Film kommt auf die Leinwand' (a film comes to the screen / is released) or 'einen Star auf der Leinwand sehen' (to see a star on the screen).
Viele Fans freuen sich darauf, ihren Lieblingsschauspieler wieder auf der Leinwand zu sehen.
Many fans are looking forward to seeing their favorite actor on the screen again.
linen / canvas
Leinwand and Leinen can both refer to a painting surface. Leinwand usually names the specific painting surface stretched over a frame. With Leinen, the focus is more on the fabric from which the painting surface is made.

Für das neue Gemälde spannt die Künstlerin eine Leinwand auf den Rahmen.
For her new painting, the artist stretches a canvas over the frame.
Für das neue Gemälde wählt die Künstlerin feines Leinen als Malgrund.
For her new painting, the artist chooses fine linen as the painting surface.