1. Iter, itineris, n., way, is inflected regularly throughout from the stem itiner-.
2. Supellex, supellectilis, f., furniture, is confined to the Singular. The oblique cases are formed from the stem supellectil-. The ablative has both -ī and -e.
3. Jecur, n., liver, forms its oblique cases from two stems,—jecor- and jecinor-. Thus, Gen. jecoris or jecinoris.
4. Femur, n., thigh, usually forms its oblique cases from the stem femor-, but sometimes from the stem femin-. Thus, Gen. femoris or feminis.
General Principles of Gender in the Third Declension.
[43]. 1. Nouns in -ō, -or, -ōs, -er, -ĕs are Masculine.
2. Nouns in -ās, -ēs, -is, -ys, -x, -s (preceded by a consonant); -dō, -gō (Genitive -inis); -iō (abstract and collective), -ūs (Genitive -ātis or -ūdis) are Feminine.
3. Nouns ending in -a, -e, -i, -y, -o, -l, -n, -t, -ar, -ur, -ŭs are Neuter.
Chief Exceptions to Gender in the Third Declension.
[44]. Exceptions to the Rule for Masculines.