-acus

See also: acus and aĉus

Latin

Etymology 1

From Gaulish, from Proto-Celtic *-ākos (adjective-forming suffix).

Suffix

-ācus (feminine -āca, neuter -ācum); first/second-declension suffix

1. Suffixed to nouns to create adjectives, often substantivised in toponyms.

   Synonym: -ānus

   ‎Aurēlius + ‎-ācus → ‎Aurēliācum

   ‎Paulus + ‎-ācus → ‎Pauliācus

Usage notes

• In toponyms, mainly in northern Gaul and in northern Italy (Cisalpine Gaul) -ācus is commonly found appended to personal names, denoting the owner of a property or fundus. Rendered -ac, -at, -y, -é in modern French toponyms, and -ago in modern Italian toponyms.

Declension

First/second-declension adjective.

	singular				plural
	masculine	feminine	neuter		masculine	feminine	neuter
nominative	-ācus	-āca	-ācum		-ācī	-ācae	-āca
genitive	-ācī	-ācae	-ācī		-ācōrum	-ācārum	-ācōrum
dative	-ācō	-ācae	-ācō		-ācīs
accusative	-ācum	-ācam	-ācum		-ācōs	-ācās	-āca
ablative	-ācō	-ācā	-ācō		-ācīs
vocative	-āce	-āca	-ācum		-ācī	-ācae	-āca

Etymology 2

From Ancient Greek -ακός (-akós, adjective-forming suffix).

Suffix

-acus (feminine -aca, neuter -acum); first/second-declension suffix

1. Suffixed to nouns to create adjectives

   Synonym: -ānus

   ‎Corinthus + ‎-acus → ‎Corinthiacus

Declension

First/second-declension adjective.

	singular				plural
	masculine	feminine	neuter		masculine	feminine	neuter
nominative	-acus	-aca	-acum		-acī	-acae	-aca
genitive	-acī	-acae	-acī		-acōrum	-acārum	-acōrum
dative	-acō	-acae	-acō		-acīs
accusative	-acum	-acam	-acum		-acōs	-acās	-aca
ablative	-acō	-acā	-acō		-acīs
vocative	-ace	-aca	-acum		-acī	-acae	-aca

Derived terms

Latin terms suffixed with -acus

Aureliacum

Corinthiacus

ebriacus

elegiacus

meracus

Pauliacus

portulaca

Salvaniacum

Salviniacum

Silbannacus

Syriacus

Descendants

• → English: -ac