-icus

From i-stem + -cus, occurring in some original cases and later used freely. Cognate with Ancient Greek -ικός (-ikós), Proto-Germanic *-igaz (Old High German and Old English -ig, Gothic -𐌴𐌹𐌲𐍃 (-eigs)), Sanskrit -इक (-ika), Proto-Slavic *-ьcь (the last has fossilized into a nominal agent suffix, but probably originally also served adjectival functions).

Pronunciation

• (Classical) IPA^(key): /i.kus/, [ɪkʊs̠]
• (modern Italianate Ecclesiastical) IPA^(key): /i.kus/, [ikus] (stressed on the antepenult)

Suffix

-icus (feminine -ica, neuter -icum); first/second-declension suffix

1. belonging to
2. derived from
3. of or pertaining to; connected with; -ic, -ish

Usage notes

The suffix -icus is added to a noun, adjective, verb, etc., to form an adjective.

Examples:

‎ūnus (“one”) + ‎-icus → ‎ūnicus (“single, unique”)

‎amō (“I love”) + ‎-icus → ‎amīcus (“loving, friendly”)

‎Gallia (“Gaul”) + ‎-icus → ‎gallicus (“Gallic, Gaulish”)

‎metallum (“metal”) + ‎-icus → ‎metallicus (“metallic”)

Declension

First/second-declension adjective.

Number	Singular				Plural
Case / Gender	Masculine	Feminine	Neuter		Masculine	Feminine	Neuter
Nominative	-icus	-ica	-icum		-icī	-icae	-ica
Genitive	-icī	-icae	-icī		-icōrum	-icārum	-icōrum
Dative	-icō		-icō		-icīs
Accusative	-icum	-icam	-icum		-icōs	-icās	-ica
Ablative	-icō	-icā	-icō		-icīs
Vocative	-ice	-ica	-icum		-icī	-icae	-ica