Pes membrum corporis est.

Pes is nominative singular. It is in the nominative because it is the subject of the sentence: the foot is the thing being talked about.

The dictionary form is pes, pedis = foot.

Because membrum is a predicate nominative after est (is). In Latin, when you say X is Y, both X and Y are usually in the nominative.

So in Pes membrum corporis est:

• pes = subject
• membrum = what the subject is

This is similar to English The foot is a limb/body part.

Corporis is genitive singular, meaning of the body.

The basic noun is corpus, corporis = body.
Its genitive singular form, corporis, shows possession or relationship.

So membrum corporis means a limb/member of the body.

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

So pes can mean:

• the foot
• a foot

and membrum corporis can mean:

• the body part of the body
• a body part of the body

In practice, the exact English article depends on context.

Latin word order is much freer than English word order because the endings show each word’s role.

Placing est at the end is very normal in Latin, especially in simple statements. But other orders are possible too, such as:

• Pes est membrum corporis
• Membrum corporis pes est (less neutral, more marked)

The original order is a natural, straightforward Latin way to say it.

They are:

• pes, pedis — foot
• membrum, membri — limb, member, body part
• corpus, corporis — body
• sum, esse — to be; est = he/she/it is

Latin dictionaries usually give nouns as nominative + genitive, because that helps you identify the declension and stem.

Because the noun is not built from the nominative alone. Its full pattern is based on the stem seen in the genitive:

• nominative: pes
• genitive: pedis

So the stem is ped-, and that appears in many other forms:

• pedis
• pedi
• pedem
• pede

This is why English words like pedal and pedestrian are related to Latin pes/ped-.

They belong to different declensions:

• pes, pedis — 3rd declension
• membrum, membri — 2nd declension neuter
• corpus, corporis — 3rd declension neuter

This matters because each declension has its own set of endings.

For example:

• membrum is nominative singular neuter in the 2nd declension
• corporis is genitive singular of a 3rd-declension neuter noun

Yes. English member ultimately comes from Latin membrum.

In Latin, membrum can mean:

• a limb
• a part of the body
• more broadly, a member or part of a larger whole

So the connection is very direct.

A common classical-style pronunciation would be roughly:

PES MEM-brum COR-po-ris est

A little more exactly:

• pes — like pess
• membrum — MEM-broom
• corporis — COR-po-ris
• est — est

Some details:

• c in corporis is always hard, like k
• v does not appear here, so there is no special issue there
• final -m in classical pronunciation was weak, but beginners often pronounce it clearly

Yes. Depending on context, membrum corporis can be translated in a few natural ways, such as:

• The foot is a limb of the body
• The foot is a body part
• The foot is a part of the body

If the meaning has already been given to the learner, the main grammar point is that corporis means of the body and membrum identifies what pes is.

Because the subject pes is singular, not plural. So the verb must also be singular:

• pes = foot
• est = is

If the subject were plural, you would need a plural verb. For example:

• Pedes membra corporis sunt = Feet are parts/limbs of the body

So est agrees with pes in number.