Why is porticus, porticūs a feminine fourth-declension noun?

1. Are most 4th declension nouns are feminine?
2. What are examples of 4th declension nouns?
3. Which noun is declined in 4th declension?

Are most 4th declension nouns are feminine?

Fourth declension is Latin's u-stem declension in which almost all the nouns are masculine in gender.

What are examples of 4th declension nouns?

Examples of fourth declension nouns: adventus , –us (m.) comitatus , –us (m.) exitus, –us (m.)

Which noun is declined in 4th declension?

Feminine and masculine nouns are declined alike. The following are the only 4th Declension neuter nouns: cornū, -ūs, horn genū, -ūs, knee gelū, -ūs, frost, chill pecū, -ūs, herd, flock verū, -ūs, spit, tip of javelin specus, -ūs, cave (also masc. and fem.)