What does dēnus mean in Latin?

dēnus, a numeral, means “ten each; ten”.

How do you pronounce dēnus?

In classical Latin, [ˈdeː.nʊs]; in ecclesiastical (church) Latin, [ˈdɛː.nus].

Proto-Indo-European *déḱm̥ → Proto-Italic *dekəm → Latin dēnus.

numeralfirst/second-declension numeral

dēnus (feminine dēna, neuter dēnum)

Classical[ˈdeː.nʊs]Ecclesiastical[ˈdɛː.nus]

in pluralnumeralten each
numeralpoeticten
Etsi quater denus bis iam mihi volvitur annusc. 397 CE – 430 CE, Cyprianus Gallus, Iesu Naue 438

singular
form	masculine	feminine	neuter
nominative	dēnus	dēna decēna	dēnum decēnum
genitive	dēnī decēnī	dēnae decēnae	dēnī decēnī
dative	dēnō decēnō	dēnae decēnae	dēnō decēnō
accusative	dēnum decēnum	dēnam decēnam	dēnum decēnum
ablative	dēnō decēnō	dēnā decēnā	dēnō decēnō
vocative	dēne decēne	dēna decēna	dēnum decēnum

plural
form	masculine	feminine	neuter
nominative	dēnī decēnī	dēnae decēnae	dēna decēna
genitive	dēnum dēnōrum, decēnōrum, decēnum	dēnum dēnārum, decēnārum, decēnum	dēnum dēnōrum, decēnōrum, decēnum
dative	dēnīs decēnīs	dēnīs decēnīs	dēnīs decēnīs
accusative	dēnōs decēnōs	dēnās decēnās	dēna decēna
ablative	dēnīs decēnīs	dēnīs decēnīs	dēnīs decēnīs
vocative	dēnī decēnī	dēnae decēnae	dēna decēna

Charlton Lewis's shorter dictionary for students: the same scholarship in plain, modern definitions.

dēnus adj.

for * dec-nus; cf. decem, δέκα, the tenth : luna, O.

Proto-Indo-European *-nós Proto-Italic *-nos Latin -nus Latin -nus Latin dēnus Apparently from earlier *deksnos, equivalent to dec(em) + -nus.