---
title: "Glasfaser: der, die or das? It’s die Glasfaser | Yupo"
description: "Short answer: die Glasfaser, “optical fibre”. Accusative: die Glasfaser; dative: der Glasfaser. Learn why it takes die and test yourself with a mini quiz."
url: https://yupolearn.com/en/word/glasfaser/
---

# Glasfaser: der, die or das?

die Glasfaser

Optical fibre

feminin · feminine [Technology and media](https://yupolearn.com/en/topics/technology-media/) Level: Advanced

**Short answer:** Glasfaser takes the article die (die Glasfaser). It’s a feminine noun (German: feminin) and means “optical fibre” in English.

## Glasfaser: word facts

- **Article**: die
- **Gender**: feminin (feminine)
- **English**: Optical fibre
- **Topic**: Technology and media
- **Yupo level**: Advanced

## Check a dictionary

You can also check the article in independent German dictionaries:

- [Glasfaser in Duden →](https://www.duden.de/suchen/dudenonline/Glasfaser)
- [Glasfaser in DWDS →](https://www.dwds.de/wb/Glasfaser)

Last updated: October 24, 2026 · [Method](https://yupolearn.com/en/about/#method)

## Why does Glasfaser take die?

Exception: most nouns ending in -er take der, but Glasfaser takes die. Learn it together with its article.

[See the article rules →](https://yupolearn.com/en/german-article-rules/#suffix-er)

## Glasfaser in the accusative and dative

Singular, with the definite article

| Nominativ subject: who? what? | die Glasfaser |
| --- | --- |
| Akkusativ direct object: whom? what? | die Glasfaser |
| Dativ indirect object: to whom? | der Glasfaser |

## More words about technology and media

[All →](https://yupolearn.com/en/topics/technology-media/)

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## die Glasfaser and 4,544 more words

In Yupo, every word comes with its article: hear it, say it, type it. The words you get wrong go into their own list. Start for free.

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