Cerarius propolin et ceram vendit.

The subject is cerarius. It is in the nominative singular, and it names the person doing the action.

You can tell it is the subject because:

• vendit is 3rd person singular
• cerarius is a singular noun that matches that verb

So the basic structure is:

• cerarius = subject
• propolin et ceram = direct objects
• vendit = verb

Because they belong to different noun patterns, but they are both still in the accusative singular.

• ceram comes from cera
• propolin comes from propolis

Both words are direct objects of vendit, so both are in the accusative, but Latin does not use the same accusative ending for every noun.

So:

• cera → ceram
• propolis → propolin

Different nouns, different accusative endings.

Because propolis is a Greek loanword in Latin, and it keeps a Greek-style accusative form here: propolin.

That can look strange if you are expecting a more familiar Latin ending, but it is normal for some Greek nouns in Latin to keep Greek forms in some cases.

So the important point is:

• propolis = dictionary form
• propolin = accusative singular form used here as the object

Vendit is:

• present tense
• indicative mood
• active voice
• 3rd person singular

Its dictionary form is vendo, vendere.

So vendit means he/she/it sells or simply sells.

Because the subject is already named as cerarius, English naturally translates it as the wax-seller sells or a wax-seller sells.

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

That means cerarius by itself can mean:

• the wax-seller
• a wax-seller

The same is true for many Latin nouns. English has to choose an article when translating, but Latin usually leaves that unstated unless the context makes it clear.

Because Latin often likes to put the verb late in the sentence, very often at the end.

So this order:

• Cerarius propolin et ceram vendit

is very natural in Latin.

But Latin word order is also fairly flexible because the endings show what each word is doing. So you could rearrange the sentence and still keep the same basic meaning, for example:

• Propolin et ceram cerarius vendit

The original order is just a normal, straightforward Latin way of saying it.

Et means and, and here it joins two direct objects:

• propolin
• ceram

So the seller is selling both things:

• propolis
• wax

The verb vendit applies to both of them.

This is a normal first-declension pattern.

For a first-declension noun like cera, the accusative singular usually ends in -am:

• nominative singular: cera
• accusative singular: ceram

Since ceram is the direct object of vendit, that accusative form is exactly what you would expect.

Because its form and its role in the sentence point to it being the subject.

• cerarius is in the nominative singular
• propolin and ceram are in the accusative singular
• vendit is singular, so it needs one singular subject

So Latin is marking the roles by case endings:

• nominative for the subject
• accusative for the direct objects

That is one of the most important habits to build in reading Latin: look at the endings, not just the word order.

Yes. Cerarius is built from cera with the suffix -arius.

That suffix often forms words for:

• a person connected with something
• a trade or occupation
• something belonging to or dealing with something

So cerarius is basically a person connected with wax, which is why it means something like wax-seller, wax-worker, or chandler, depending on context.