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The second declension is a category of nouns in Latin and Greek with similar case formation. In particular, these nouns are thematic , with an original o in most of their forms. [ 1 ] In Classical Latin , the short o of the nominative and accusative singular became u .
The second declension contains two types of masculine Greek nouns and one form of neuter Greek noun. These nouns are irregular only in the singular, as are their first-declension counterparts. Greek nouns in the second declension are derived from the Omicron declension. Some Greek nouns may also be declined as normal Latin nouns.
A few Greek nouns in -os, mostly geographical, belong to the second declension, and sometimes have an accusative in -on such as Dēlos, Acc. Dēlon (but Dēlum in prose). In the genitive singular, names in -ēs, parisyllabic, take -ī as well as -is. Some feminine nouns in -ô have the genitive in -ūs.
2nd declension nouns in -us are usually masculine, but those referring to trees (e.g. pīnus "pine tree") and some place names (e.g. Aegyptus "Egypt") are feminine. A few 2nd declension nouns, such as vir "man" and puer "boy", lack endings in the nominative and vocative singular.
Gerunds are neuter nouns of the second declension, but the nominative case is not present. The gerund is a noun, meaning "the act of doing (the verb)", and forms a suppletive paradigm to the infinitive, which cannot be declined.
Although the a of the Greek and Latin first declension was not originally a thematic vowel, it is considered one in Greek and Latin grammar. In both languages, first-declension nouns take some endings belonging to the thematic second declension. An a-stem noun was originally a collective noun suffixed with -eh₂, the ending of the neuter plural.
This list of Latin and Greek words commonly used in systematic names is intended to help those unfamiliar with classical languages to understand and remember the scientific names of organisms. The binomial nomenclature used for animals and plants is largely derived from Latin and Greek words, as are some of the names used for higher taxa , such ...
Second-declension masculine nouns have a regular vocative ending in -ε. Third-declension nouns with one syllable ending in -ς have a vocative that is identical to the nominative (νύξ, night); otherwise, the stem (with necessary alterations, such as dropping final consonants) serves as the vocative (nom. πόλις, voc. πόλι; nom ...