Glasyren är blå.

Because Swedish usually marks the by adding an ending to the noun.

• en glasyr = a glaze / an icing
• glasyren = the glaze / the icing

Since glasyr is an en-word, its definite singular form is glasyren.

In Swedish, the definite article is often attached to the noun as a suffix instead of standing alone as a separate word.

So:

• English: the glaze
• Swedish: glasyren

A separate word like den is used in some other structures, especially when there is an adjective before the noun:

• den blå glasyren = the blue glaze

But in Glasyren är blå, the noun already carries the definite ending, so no separate the-word is needed.

Är is the present tense of vara, which means to be.

So:

• är = is / are / am depending on context

In this sentence, it means is:

• Glasyren är blå = The glaze is blue

Because the subject glasyren is a singular en-word.

Swedish adjectives often agree with the noun:

• singular en-word: blå
• singular ett-word: blått
• plural: blå

So:

• Glasyren är blå
• Huset är blått
• Bilarna är blå

Since glasyr is an en-word, blå is the correct form.

This is a very common question. After är, the adjective is predicative rather than directly attached to the noun.

In predicative position, Swedish adjectives agree mainly with gender and number, not with definiteness.

So:

• den blå glasyren = the blue glaze
  
  • here blå is directly before the noun
• glasyren är blå = the glaze is blue
  
  • here blå comes after är, so it stays in the predicative form

That is why blå is correct here, not blåa.

You usually learn Swedish nouns together with their article:

• en glasyr

There is no fully reliable rule that lets you guess every noun’s gender, so it is best to memorize the noun with en or ett.

In this sentence, you can also tell from the definite form glasyren, because -en is the usual definite singular ending for en-words.

A rough guide is:

• Glasyren ≈ gla-SY-rən
• är ≈ air
• blå ≈ bloh

A more exact point:

• the y sound in glasyren is not like English y in yes. It is a rounded vowel that English does not really have.
• å in blå sounds like a long aw/o-type vowel.

If you want a more technical version, you may hear something close to:

• glasyren: [ɡlaˈsyːrɛn]
• är: [ɛːr]
• blå: [bloː]

Yes. In a normal Swedish statement, the basic order is:

subject + verb + complement

So:

• Glasyren = subject
• är = verb
• blå = complement

That gives:

• Glasyren är blå.

If you want to make it a yes/no question, Swedish usually puts the verb first:

• Är glasyren blå? = Is the glaze blue?

Yes. Glasyr can refer to:

• glaze on ceramics or pottery
• icing/frosting/glaze on baked goods, depending on context

So the exact meaning depends on what you are talking about. The grammar in the sentence stays the same either way.

Because in Swedish, colors and ordinary adjectives are normally written with lowercase letters.

So:

• blå = correct
• Blå = only if it starts a sentence or is part of a name

That is the same idea as in English with words like blue, except Swedish also keeps language names and many other adjectives lowercase more often than English does.

Yes, if the thing has already been mentioned and the context is clear.

• Glasyren är blå. = The glaze is blue.
• Den är blå. = It is blue.

Using glasyren names the thing explicitly. Using den sounds more natural when both speakers already know what is being talked about.

Yes, it is a perfectly natural simple sentence.

It is short and neutral, and it works well for:

• describing color
• practicing basic word order
• showing how definiteness and adjective agreement work

It is the kind of sentence you might see in a textbook because it is grammatically useful and very clear.