Coagmentum tenue est.

Coagmentum is nominative singular neuter.

Why:

• the ending -um here is the regular nominative singular ending of many second-declension neuter nouns
• in a sentence with est, the subject is normally in the nominative
• coagmentum is the thing being described, so it is the subject

So grammatically, coagmentum is the neuter singular subject of the sentence.

Because tenue is the neuter nominative singular form of the adjective.

The adjective comes from:

• masculine/feminine: tenuis
• neuter: tenue

Since coagmentum is:

• neuter
• singular
• nominative

the adjective has to match it, so Latin uses tenue.

This is called agreement: adjectives agree with the nouns they describe in gender, number, and case.

Est is the third-person singular present tense of esse, meaning to be.

So est means is.

In this sentence, est is a linking verb. It connects:

• the subject: coagmentum
• the description of the subject: tenue

So the structure is:

• coagmentum = subject
• tenue = predicate adjective
• est = linking verb

No. Tenue is not an object.

A common English-speaking learner may expect every verb to have a subject and maybe an object, but esse does not work that way. It is a linking verb, not an action verb taking a direct object.

So here:

• coagmentum is the subject
• tenue is a predicate adjective, describing the subject
• there is no direct object

That is why both coagmentum and tenue are in the nominative, not the accusative.

You know from the grammar and the sentence pattern.

In coagmentum tenue est:

• coagmentum is a noun in the nominative singular
• tenue is an adjective in the nominative singular neuter
• est links them

The noun is the subject, and the adjective describes it.

So the sentence means:

• the coagmentum is thin not
• the thin thing is a coagmentum

In simple sentences like this, Latin usually makes the basic relationship clear through word forms rather than strict word order.

No. Latin word order is much more flexible than English word order.

This sentence is written as:

• coagmentum tenue est

But Latin could also say, for example:

• tenue coagmentum est
• coagmentum est tenue

The core meaning would stay the same, because the endings show how the words relate.

However, different word orders can give different emphasis or style. The version you have is a perfectly normal way to say it.

Because Classical Latin does not have articles like English a, an, or the.

So coagmentum by itself can mean, depending on context:

• a coagmentum
• the coagmentum
• sometimes just coagmentum in a more general sense

Latin leaves that distinction to context instead of marking it with an article.

• Coagmentum is a second-declension neuter noun
• tenue is from a third-declension adjective, tenuis, tenue

That means they do not belong to the same declension pattern, but they can still go together perfectly well. In Latin, an adjective does not have to be in the same declension as the noun it modifies. It only has to agree in:

• gender
• number
• case

So a third-declension adjective can describe a second-declension noun without any problem.

Sometimes yes. Latin can omit forms of esse when the meaning is obvious, especially in certain styles, short statements, poetry, or inscriptions.

So in some contexts, coagmentum tenue could be understood as:

• the coagmentum is thin

But it could also simply mean:

• a thin coagmentum

Because of that possible ambiguity, beginners usually see est written out in full sentences like this. With est present, the sentence is clearly predicative: it is thin.

In a Classical Latin pronunciation, a helpful approximation is:

• co-ag-MEN-tum TE-nu-e est

A few points:

• c is always hard, like k
• g is always hard, as in go
• tenue has three syllables: te-nu-e
• est is pronounced with a clear t

So the whole sentence is pronounced smoothly, but each vowel is still heard clearly.