Chapter 092Allen and Greenough's Latin GrammarDickinson CollegeChristopher Francese
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The following peculiarities in case-forms of the Fourth Declension require notice:—
A genitive singular in
-ī
(as of the second declension) sometimes occurs in nouns in
-tus
: as,
senātus
, genitive
senātī
(regularly
senātūs
).
In the genitive plural
-uum
is sometimes pronounced as one syllable, and may then be written
-um
: as,
currum(Aen. 6.653)
for
curruum
.
The dative and ablative plural in
-ŭbus
are retained in
partus
and
tribus
;
so regularly in
artus
and
lacus
, and occasionally in other words;
portus
and
specus
have both
-ubus
and
-ibus
.
Most names of plants and trees, and
colus
,
distaff
, have also forms of the second declension: as,
fīcus
,
fig
, genitive
fīcūs
or
fīcī
.
An old genitive singular in
-uis
or
-uos
and an old genitive plural in
-uom
occur rarely: as,
senātuis
,
senātuos
;
fluctuom
.
The ablative singular ended anciently in
-ūd
(cf. §
43
. N. 1): as,
magistrātūd
.