uterus, womb
For adjective stems in -ro- with nominative -rus, see [615].
[454]. Masculine stems in -ro- preceded by a short vowel or a mute, except those above ([453]), drop -os in the nominative, and have no vocative: as, stem puero-, N. puer, boy ([111, b]). Most masculines in -ro- have a vowel before r only in the nominative -er ([111, b]): as agro-, N. ager. But in compounds ending in -fer and -ger, carrying, having, and the following, the vowel before -r is a part of the stem, and is found in all the cases:
adulter, Līber, paramour, Liber
gener, socer, son-in-law, father-in-law
puer, vir, boy, man
līberī, vesper, children, evening
For Mulciber, Hibēr, and Celtibē̆r, see the dictionary; for adjective stems in -ro- with nominative -r, see [616]. Once socerus (Pl.).
[455]. nihilum, nothing, usually drops -um in the nominative and accusative, becoming nihil or nīl, and similarly nōn, not, may be for noenum, naught ([99]). famul is used for famulus, slave, by Ennius and Lucretius, once each ([111, b]).
[456]. Substantives ending in -ius or -ium (but never adjectives), have commonly a single -ī in the genitive singular: as,