Is this the correct declension of mater?

Mater
Matri
Matro
Matrum
Matro
Matri
Matrorum
Matris
Matros
Matris
~thanks

No, sorry.

Mater is a 3rd declension noun; you've given it the endings of a 2nd declension masculine noun.

--
-is
-i
-em
-e

-es
-ium
-ibus
-es
-ibus

http://www.everything2.com/title/Latin%2520noun%2520declensions

That plural genitive ending should be

-um (not -ium)

Would it then be...

Mater
Matris
Matri
Matrem
Matre
Matres
Matrum
Matribus
Matres
Matribus

Yes. Perfect!

Yes, the declension you provided is indeed correct for the Latin word "mater" (meaning "mother"). It appears to be the declension for the singular form of "mater."

To determine the correct declension of a Latin noun, you follow these steps:

1. Identify the gender of the noun. Nouns in Latin can be masculine, feminine, or neuter. In the case of "mater," it is a feminine noun.

2. Find the stem of the noun. The stem is the part of the word that remains the same throughout its different forms. In this case, the stem of "mater" is "matr-".

3. Add the appropriate endings for each case. Each case in Latin has its own set of endings. In the declension you provided:
- The nominative singular is "mater."
- The genitive singular is "matri."
- The dative singular is "matro."
- The accusative singular is "matram."
- The ablative singular is "matre."

4. Repeat the process for the plural forms. In the declension you provided:
- The nominative plural is "matres."
- The genitive plural is "matrum."
- The dative plural is "matribus."
- The accusative plural is "matres."
- The ablative plural is "matribus."

By understanding the gender, stem, and case endings, you can correctly decline Latin nouns. However, it's important to note that Latin declensions can vary depending on the noun's declension class. So, it's always a good idea to consult a reliable Latin grammar reference for specific noun declensions.