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-eus

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Etymology and origin of the Latin word -eus

Latin has three suffixes spelled -eus: an inherited adjective ending, an adjective ending taken from Greek, and an ending of Greek male names.[1]

-eus1 of material

Confidence
Established
Formation
Inherited
First attested
c. 280–200 BC Livius Andronicus
Inherited from
Proto-Italic *-eos
Ultimate origin
Proto-Italic *-eos

Pronunciation

  • Classical: [e.ʊs][1]
  • Ecclesiastical: [e.us][1]

Forms

-eus (feminine -ea, neuter -eum); first/second-declension suffix[1]

Etymology

The suffix for adjectives of material is inherited from Proto-Italic *-eos, which Wiktionary traces to Proto-Indo-European *-e- with *-yós.[1] According to Weiss, its Indo-European parent already made adjectives of material, as in Ancient Greek χρύσεος (khrúseos, “golden”), from χρυσός (khrusós, “gold”).[2] He reports Alan Nussbaum's point that Homer also has it in merely genitival adjectives, and that this wider use is probably the older.[2]

Earliest recorded meaning

Livius Andronicus already has aureus “golden”, from aurum, and argenteus “of silver”, from argentum, and Plautus has ferreus, ligneus and lapideus.[2]

Semantic evolution

Latin extended it to adjectives of colour, such as niveus “snow-white” and roseus “rose-coloured”; purpureus is probably modelled on Ancient Greek πορφύρεος (porphúreos).[2] It was also added to adjectives that already meant “made of”, with no change of meaning: aēneus beside aēnus, eburneus beside eburnus.[2] Enlarged forms made -āceus, mainly in farming terms, and -āneus, often from compounds, which does not share the basic sense.[2] Weiss describes the forms as predominantly poetic.[2]

Timeline

Meanings

Suffix

  1. Forms adjectives from nouns, chiefly of material: charteus, ligneus, corneus.[4][1][2]
  2. Forms adjectives of colour: niveus, purpureus, roseus.[1][2]
  3. Rarely, forms adjectives from other nouns.[1]

Word family

-eus2 from Greek -εῖος

Confidence
Established
Formation
Borrowing
First attested
70–19 BC Virgil
Borrowed from
Ancient Greek -εῖος
Ultimate origin
Ancient Greek -εῖος

Pronunciation

  • Classical: [ˈeː.ʊs][1]
  • Ecclesiastical: [ˈɛː.us][1]

Forms

-ēus (feminine -ēa, neuter -ēum); first/second-declension suffix[1]

Etymology

The suffix for adopted adjectives is borrowed from Ancient Greek -εῖος (-eîos), and in some words it comes from adjectives ending in -ιος (-ios).[1][2] Wiktionary gives that Greek ending two possible sources: Proto-Indo-European *-e- with *-yós, and *-iH- with *-wós, the latter being the source of the native -īvus.[1]

Earliest recorded meaning

Weiss cites Achillēus “of Achilles” from Virgil on.[2]

Semantic evolution

It mainly goes on Greek stems, but occasionally on a Latin base, as in Cupīdineus “of Cupid”, which Weiss cites from the Culex.[2]

Timeline

  • 70–19 BC – Virgil has Achillēus.[2][3]

Meanings

Suffix

  1. The ending of adjectives and nouns adopted from Greek, surviving as such or as -īvus: Achillēus, Cupīdineus.[1][2]

Word family

  • Achillēus
  • Cupīdineus

-eus3 in Greek names

Confidence
Established
Formation
Borrowing
Borrowed from
Ancient Greek -εύς
Ultimate origin
Ancient Greek -εύς

Pronunciation

  • Classical: [ɛu̯s][1]
  • Ecclesiastical: [eu̯s][1]

Forms

-eus m (genitive -eī or -eos); second declension[1]

Etymology

The suffix for adopted male names is borrowed from Ancient Greek -εύς (-eús),[1] which Wiktionary tentatively refers further back to Pre-Greek.[1]

Meanings

Suffix

  1. The ending of masculine names adopted from Greek, with the genitive -eī or -eos: Orpheus, Perseus, Thēseus.[1][4]

Word family

  • Atreus
  • Orpheus
  • Perseus
  • Thēseus

Usage notes

The short e of the native suffix stayed unweakened because a vowel follows it directly, as in aureus.[2][5]

References

  1. ^ a b c d e f g h i j k l m n o p q r s t Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d e f g h i j k l m n o p q r s Weiss, Michael (2020), Outline of the Historical and Comparative Grammar of Latin, 2nd ed., Ann Arbor: Beech Stave
  3. ^ a b c d e Köbler, Gerhard (2010), Lateinisches Abkunfts- und Wirkungswörterbuch für Altertum und Mittelalter, online ed., koeblergerhard.de
  4. ^ a b Glare, P. G. W., ed. (2012), Oxford Latin Dictionary, 2nd ed., Oxford: Oxford University Press
  5. ^ Meiser, Gerhard (2010), Historische Laut- und Formenlehre der lateinischen Sprache, 3rd ed., Darmstadt: WBG

Related etymologies

Cite this entry

“-eus.” Etymologically, 6 Nov. 2026, etymologically.com/la/-eus. Accessed 6 Nov. 2026.

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