Iecur in corpore est.

Iecur is nominative singular, because it is the subject of est.

The full dictionary form is iecur, iecoris n. It is a neuter noun. In this sentence, iecur is the thing being talked about, so it appears in the nominative.

Because in here means in / inside / within in the sense of location, and with that meaning it takes the ablative case.

So:

• corpus = nominative or accusative singular
• corpore = ablative singular

Since the sentence describes where something is, Latin uses in + ablative:

• in corpore = in the body

This is a very common Latin pattern:

• in + ablative = location: in, on, inside
• in + accusative = motion toward / into

So:

• in corpore est = it is in the body
• in corpus would suggest movement into the body

Here the sentence is about where the liver is, not movement, so corpore is correct.

Latin word order is much more flexible than English word order. Very often, especially in simple sentences, the verb comes at or near the end.

So Iecur in corpore est is perfectly normal Latin.

You could also say:

• Iecur est in corpore

That would mean essentially the same thing, but the placement of words can slightly change emphasis. Ending with the verb is very common and natural in Latin.

No. Classical Latin has no articles like English the or a/an.

So iecur can mean:

• the liver
• a liver

And in corpore can mean:

• in the body
• in a body

The exact choice in English depends on context.

Corpus, corporis n. is a third-declension neuter noun.

Its stem is corpor-, which is why the ablative singular is corpore.

Some useful forms are:

• nominative singular: corpus
• genitive singular: corporis
• ablative singular: corpore

So in this sentence, corpore is simply the ablative singular form of corpus.

Yes. Iecur, iecoris n. is usually treated as an irregular third-declension neuter noun.

A learner may notice that iecur does not look like many more familiar third-declension nouns, and that is because it is somewhat irregular. But in this sentence, the important point is simple:

• iecur = nominative singular subject

Because the subject, iecur, is singular.

Est means is and is the third person singular form of esse.

So the agreement is:

• iecur = singular subject
• est = singular verb

If the subject were plural, Latin would use sunt instead.

Yes. Latin allows several word orders, for example:

• Iecur in corpore est
• In corpore iecur est
• Iecur est in corpore

All of these can mean the same basic thing. The differences are mostly about emphasis or style, not core grammar.

The version with est at the end is especially typical of Latin style.

In a simple Classical-style pronunciation, you can say it roughly as:

YEH-koor in KOR-po-re est

A slightly more careful guide:

• iecur: initial i sounds like English y, so roughly yeh-koor
• in: like in
• corpore: KOR-po-re
• est: est

The c in Latin is always hard, like k, so corpore begins with a k sound, not an s sound.

They are:

• iecur, iecoris n. = liver
• in = in, on, into
• corpus, corporis n. = body
• sum, esse, fui = to be

This is useful because Latin dictionaries usually list nouns by nominative + genitive, and verbs by their principal parts.