Conspectus parvus Regula Generalis In general the diminutive of nouns of the first or second declension which end in obstruents or the
semivowel /w/ (written ) take the suffix -ulus/-ula/-ulum (depending on
grammatical gender).
Stems ending in Vowels Nouns of the first or second declension whose stems end in a vowel typically take -ola, -olus, or -olum depending on if they are of the feminine, masculine, or neuter gender respectively. Words ending in the glide /w/ (written v), take -ul- like other stems ending in consonants (cf. cerva/cervula). In the first declination, -ia can become =illa or =ola. (Lucia → Lucilla, sed Tullia → Tulliola).
Roots with -ul- Nouns whose stems end in -ul- (either the root itself, or due to the noun in question being a diminutive already), when their diminutive is formed, the stem-final, -ul- changes either to -ell- or -ill-. It is difficult to find any regular correspondence between the context surrounding -ul- and whether the diminutive's stem ends in -ell- or -ill-. In the table below, those which are diminutives already have the original stem listed under "principle". In cases where the diminutive's meaning is very different from that of the original noun, the noun in question is enclosed with parentheses. The double diminutives of words ending in -er, or -in-, are usually formed by adding -ul- to the end of the existing diminutive..
Roots with -r- Roots with -n- Roots with -xill- Exceptions == Third declension ==