Questions & Answers about Limbus caeruleus est.
Est means is. In Latin, the verb often comes at the end of the sentence, especially in simple statements. That is very normal Latin word order.
Unlike English, Latin does not rely heavily on word order to show who is doing what, because the word endings already give a lot of that information. So Limbus caeruleus est is natural Latin for a sentence like The border is blue.
Caeruleus is an adjective. It describes limbus.
So in this sentence:
- limbus = the noun
- caeruleus = the adjective describing that noun
- est = the verb is
Latin often uses the same basic pattern as English here: noun + describing word + linking verb.
It ends in -us because it has to agree with limbus.
In Latin, adjectives agree with the nouns they describe in:
- gender
- number
- case
Limbus is masculine, singular, and nominative, so caeruleus must also be masculine, singular, and nominative.
If the noun were feminine, you would expect caerulea.
If it were neuter, you would expect caeruleum.