normaly these are the decorated window panes in churches made of pieces of glass bound with a lead junction (originally). But it could also be any decoration process based on glass pieces

Masculin word.

DEF – stained-glass window. A decorative
window, usually found in churches, made
of pieces of coloured glass or glass that
has been flashed or enamelled, fitted into
channelled lead strips, and set in an iron
framework. Source

EX – Stained-glass window, Chartres
Cathedral. Source

OBS – stained glass ... The glass
colouring is not a stain, but is fired into the
glass. Source

stained-glass ['steNndglA:s] adj stained-glass window, fenêtre f en vitrail.
Harraps

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Note added at 2003-03-02 16:03:59 (GMT)
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repeints. Les vantaux de fenêtre en vitrail ont tous été restaurés
par la société MAJERUS reconnue comme artisan d\'art. Le ...
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Untitled Document
Cadeau de Classe 96 - Fenêtre en vitrail. Après les rénovations
sur le mess des élof au collège, il existe un endroit excellent ...
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Les origines du vitrail

Les origines du vitrail sont mal connues et sa fabrication demande une technique et un savoir-faire particuliers pour obtenir des tons variés et délicats. C'est en France au cours du XIIe siécle que cet art connut un prodigieux développement. Les ateliers des maîtres verriers suivaient alors les chantiers où l'on bâtissait les cathédrales.

It seems a mirror, but from the other side, the person can see you.

It seems a mirror, but from the other side, the person can see you.

normally there is a "-" between stain and glass. As there is none, it could also simply be windows with stains.

I know it's far-fetched, but stained is also "tachée"

immeubles aux fenêtres métallisées

vitrail c'est stained glass window - on ne dira pas fenêtre en vitrail pour une église ou une cathédrale

dans une maison ou un bureau si l'on veut dire une fenêtre avec des vitres ou des carreaux coloré(e)s et travaillé(e)s/ comme du vitrail on peut dire fenêtre à vitrail ou fenêtre vitrail.

Mais vitrail seul suffit.

Exemple

L'artisan prépare un vitrail pour une fenêtre des bureaux de telle ou telle entreprise

La cathédrale de Chartres - [ Translate this page ]
... Chartres est la seule grande cathédrale gothique à avoir encore ses vitraux,
ses sculptures et son architecture de l'époque de sa construction.

a bustling open-air market Saturday mornings in Chartres as well as the famous Chartres
Cathedral, known worldwide for its stain glass windows

Le vitrail,vu par des artistes verriers contemporains renouvelle sa place dans la décoration intérieure. Selon le lieu, un projet dessiné à l1échelle est proposé ainsi que la gamme des verres employés. Les vitraux s1adaptent et s1intègrent dans toutes architectures: bâtiments publics et maisons particulières.

Le verre est notre médium: au travers du vitrail,votre décor est en perpétuel mouvement.


The stained glass window, as it is conceived by contemperary glaziers, finds a new place in interior decoration. According to the location, a small scale project is proposed together with the varieties of glass that are to be used. The stained glass windows are adapted to and integrate with all kinds of architecture : public buildings and private houses.

Glass is our medium : Through the stained glass window, your environment is in constant change.


also for the English terms :

Stain Glass or Stained Glass ?
The proper term is stained glass. Since the color is produced during the manufacturing stage it would put it in the past tense, hence stained. However there is a process in which stains are
applied to the stained glass and fired in with a kiln. This is usually done for added effects such as facial or other body features, shadowing, or
other special effects to enhance the beauty of the project. Though this process is often refered to as glass painting.