What does quadrīnus mean in Latin?

quadrīnus, a numeral, means “four each; quadruple; four”.

How do you pronounce quadrīnus?

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

numeralfirst/second-declension numeral

quadrīnus (feminine quadrīna, neuter quadrīnum)

Classical[kʷaˈdriː.nʊs]Ecclesiastical[kʷaˈdriː.nus]

singular
form	masculine	feminine	neuter
nominative	quadrīnus	quadrīna	quadrīnum
genitive	quadrīnī	quadrīnae	quadrīnī
dative	quadrīnō	quadrīnae	quadrīnō
accusative	quadrīnum	quadrīnam	quadrīnum
ablative	quadrīnō	quadrīnā	quadrīnō
vocative	quadrīne	quadrīna	quadrīnum

plural
form	masculine	feminine	neuter
nominative	quadrīnī	quadrīnae	quadrīna
genitive	quadrīnum quadrīnōrum	quadrīnum quadrīnārum	quadrīnum quadrīnōrum
dative	quadrīnīs	quadrīnīs	quadrīnīs
accusative	quadrīnōs	quadrīnās	quadrīna
ablative	quadrīnīs	quadrīnīs	quadrīnīs
vocative	quadrīnī	quadrīnae	quadrīna

Analogous formation after the organic trīnus, from quadri- + -nus, doublet of quaternus.