Masculine ($m$)
The classification of masculine nouns is based on specific final elements. If you see the endings -os, -or, -o, -er, -ex in the nominative singular, you are looking at a masculine noun. Special attention should be paid to the ending -es: it indicates the masculine gender only if the noun is imparisyllabic.
In addition to general rules, medical Latin contains words that must be memorized separately. These include:
- tendo, ĭnis m
- margo, ĭnis m
- canalis, is m
Feminine ($f$)
Feminine nouns in the third declension have the greatest number of ending variations, which are conveniently divided into several subgroups.
- The group of endings in -s: includes the endings -as, -is, -us, as well as parisyllabic nouns ending in -es.
- The group of endings in -x: combines nouns ending in -ax, -ix, -ux.
- The group of consonant endings: this includes words ending in the combinations -rs, -ns, -nx.
- Other endings: nouns with the markers -do, -go, -io.
Words that must be memorized within this group include gaster, tris f and mater, tris f. Another excellent example is the term dura mater.
Neuter ($n$)
Neuter nouns are easily recognized by a number of endings. Neuter markers include: -men, -us, -ur, -ma, -e, -al, -ar, -ut.
However, this particular group contains short but extremely important terms that require rote memorization. Pay special attention to the following words:
- os, ossis n
- os, oris n
- cor, cordis n
Exceptions to gender rules
In addition to standard rules and memorization words, there are strict exceptions that fall outside the general system. The most important of these concern organ names that are masculine despite having typical non-masculine endings.
Be sure to memorize:
- ren, renis m — kidney
- lien, ēnis m (or its Greek synonym splen, splenis m) — spleen
Briefly: answers to topical questions
Which third-declension masculine exception words must be learned by heart?
The following third-declension masculine exception words must be learned by heart:
- Axis; second cervical vertebra (axis, is m)
- Canal (canālis, is m)
- Tooth (dens, dentis m)
- Pons (pons, pontis m)
- Margin (margo, ĭnis m)
- Blood (sanguis, ĭnis m)
- Tendon (tendo, ĭnis m)
- Kidney (ren, renis m)
- Spleen (lien, is m / splen, is m)
Which third-declension feminine exception words are found in anatomical terminology?
The following third-declension feminine exception words, which must be memorized, are found in anatomical terminology:
- Mother; meninges (mater, tris f) — forms the terms dura mater (dura mater), pia mater (pia mater), and arachnoidea mater (arachnoid mater).
- Stomach (gaster, tris f).
Which third-declension neuter exception words must be memorized?
Among third-declension nouns, the following neuter exception words must be memorized:
- Mouth (os, oris n).
- Bone (os, ossis n).
- Heart (cor, cordis n).
- Tuber (tuber, eris n).
- Pancreas (pancreas, ătis n).
- Vessel (vas, vasis n).
What gender is the word dens (tooth) in Latin?
The word dens (tooth) in Latin is masculine. In its full dictionary form, this anatomical term is written as dens, dentis m. For example, the terms cavĭtas dentis (dental cavity) and radix dentis (root of tooth) are used.
What gender is the word vas (vessel) in Latin?
The word vas (vessel) in Latin is neuter. In the singular, it declines according to the third declension, and in the plural, according to the second declension. In dictionary form, the term is written as vas, vasis n.
What gender is the word hepar (liver) in Latin?
The word hepar (liver) in Latin is neuter and belongs to third-declension nouns. In dictionary form, this anatomical term is written as hepar, ătis n. Sources feature terms such as hepar mobile (floating liver), porta hepatis (porta hepatis), and hepar cystosum (polycystic liver).
For the feminine gender, it is convenient to visually group the endings: all variations with the letter "x" (-ax, -ix, -ux) and consonant combinations with "s" and "x" (-rs, -ns, -nx) belong to this category.
Class and exam questions
How is the gender of 3rd declension nouns determined?
Gender is determined by characteristic endings in the nominative singular (e.g., -or for masculine, -ix for feminine, -men for neuter).
Does the word canalis belong to the feminine gender because of the -is ending?
No, the term canalis, is m is a memorization word and is masculine.
What gender are the words os and cor?
The words os, ossis; os, oris, and cor, cordis are neuter nouns and must be memorized.
What else to study on this topic
- Difference between parisyllabic and imparisyllabic nouns in -es
- Declension of the exception terms ren and lien
- Declension of the memory words os, ossis and os, oris
- Features of dictionary entries for 3rd declension nouns
Master the entire topic in the "Latin Language" course
This is a summary. The course covers everything tested in classes and exams.
- Complete methodical guide on the topic "Gender of 3rd Declension Nouns" and 2,323 more pages of the subject
- Assignments and quizzes after every topic — just like in a colloquium
- AI tutor answers questions on the topic anytime
- 107 video lessons on the subject
Other topics in the section "Self-preparation for the test (3rd declension)"
Prepared by WhiteCoat Pro faculty in accordance with the medical school curriculum. For educational purposes only.