Word that increases in the geni-
Tive case when us is long, the same
Pronunciation nouns may claim—
Declined like gradūs or like manūs
Though here exceptions still detain us.
The first case and the fifth are those
Singular; short as monkey’s nose.
Long are mūs, crūs, and thūs and sūs
All monosyllables in ūs,
And Grecian nouns by diphthong ous,