Three components of a dictionary entry
Every noun in the dictionary is recorded in a strict format that includes three mandatory elements:
- The form in the nominative singular (Nominativus singularis).
- The ending in the genitive singular (Genitivus singularis). It is this ending that determines the declension type.
- The designation of grammatical gender by a single letter: m (masculine — masculinum), f (feminine — femininum), n (neuter — neutrum).
For example, the entry lamina, ae f means that the word is in the nominative (lamina), has the ending -ae in the genitive, and belongs to the feminine gender.
Determining the practical stem
The declension of words (i.e., the addition of case endings for oblique cases) is performed by adding endings strictly to the practical stem of the word. This stem may not coincide with the historical stem, but it is precisely the one needed for correct writing.
General rule: to find the practical stem, take the genitive singular form (Gen. sing.) and remove its ending. If the stems in the nominative and genitive cases match, the stem is easily isolated directly from the nominative.
| Nominative (Nom.) | Genitive (Gen.) | Dictionary form | Practical stem |
|---|---|---|---|
| lamina | laminae | lamina, ae f | lamin- |
| sulcus | sulci | sulcus, i m | sulc- |
| ductus | ductus | ductus, us m | duct- |
| facies | faciei | facies, ei f | faci- |
Features of nouns with a changing stem
Most commonly, a mismatch between the nominative and genitive stems occurs in nouns of the third declension. In such cases, the dictionary includes -is preceded by the final part of the modified stem.
Let's analyze the structure using the entry corpus, oris n as an example:
- corpus is the nominative form;
- or is the end of the modified stem;
- is is the genitive ending.
To get the full genitive form, add the stem part indicated in the dictionary and the ending itself to the truncated nominative form: corpor + is = corporis. The practical stem here is corpor-.
Important exception: for monosyllabic nouns with a changing stem, the genitive case is written out in full in the dictionary form. For example: pars, partis f (part) or cor, cordis n (heart).
How to determine grammatical gender
In Latin, just like in Russian, there are three genders: masculine, feminine, and neuter. However, gender membership is determined solely by the characteristic endings in the nominative singular, rather than by meaning or translation.
The gender of a Latin word and its Russian equivalent often do not match. Classic examples of discrepancies:
- pes, pedis m (masculine), but in Russian "стопа" (foot) is feminine;
- vertebra, ae f (feminine), but in Russian "позвонок" (vertebra) is masculine;
- caput, itis n (neuter), but in Russian "голова" is feminine.
Remember the main difference: the nominative ending indicates the gender, while the genitive ending indicates the declension.
Briefly: answers to topical questions
Which genitive singular endings correspond to each of the five declensions?
The declension type of Latin nouns is determined strictly by the genitive singular ending. The five declensions correspond to the following endings:
| Declension type | Gen. sing. ending |
|---|---|
| I | -ae |
| II | -i |
| III | -is |
| IV | -us |
| V | -ei |
It is precisely by these endings, which are mandatory in the dictionary form of a word, that a noun's belonging to a specific declension is established.
Which specific nominative endings indicate masculine, feminine, and neuter gender?
Gender is determined by the characteristic endings in the nominative singular.
- Masculine gender (masculinum) — endings -us (most words), -os, -or, -o, -er, -ex, -es, as well as anion names ending in -as and -is.
- Feminine (femininum) — ending -a, as well as the ending -s preceded by a vowel (except -o-), for example -as, -es, -is.
- Neuter gender (neutrum) — endings -um, -on, -en, -u, -e, -ma, -idum.
The grammatical gender of Latin nouns cannot be determined by the gender of the Russian translation, as they frequently do not match.
How to determine the dictionary form and stem of parisyllabic nouns of the third declension?
The dictionary form of third-declension nouns includes the nominative singular form, the genitive singular ending, and the gender designation. The sign of the 3rd declension is the genitive singular ending -is.
The practical stem is determined from the genitive singular form by dropping the ending -is. If the stems in the nominative and genitive match, the stem can also be extracted from the nominative by dropping the ending. Example: auris, is f → stem aur- based on auris without the ending -is.
Gender is identified by Nom. sing. (the first word of the entry), while declension and stem are identified by Gen. sing. (the ending after the comma).
Class and exam questions
Can the gender of a word be determined by its Russian translation?
Categorically no. The grammatical gender of Latin terms often does not coincide with Russian (for example, vertebra — vertebra, is feminine in Latin).
Why do dictionaries include letters before the ending, such as "oris"?
This indicates that the word stem in the genitive case differs from the nominative. The part "or" shows how exactly the stem changes, to which the ending "is" is then attached.
How is the dictionary form of short monosyllabic words written?
If a monosyllabic noun has a changing stem, the entire genitive form is indicated, for example: os, oris n.
What else to study on this topic
- Nominative endings for masculine, feminine, and neuter gender
- Characteristics of all five Latin declensions
- Specifics of stem extraction for 3rd declension nouns
- The difference between the historical and practical word stem
Master the entire topic in the "Latin Language" course
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Other topics in the section "Noun Morphology. Declensions. Syntax"
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