-eus

From French -eux, from Latin -ōsus.

• IPA^(key): /øːs/

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-eus

1. suffix used to form adjectives

   ambitie → ambitieus

From Proto-Italic *-eos, from Proto-Indo-European *-e- +‎ *-yós. Compare with its adoption through Ancient Greek (Etymology 2).

• (Classical Latin) IPA^(key): [e.ʊs]
• (modern Italianate Ecclesiastical) IPA^(key): [e.us] (stressed on the antepenult)

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

1. (with materials) Used to form adjectives from nouns, and so to nominally indicate the source of an attribute.

   ‎argentum (“silver”) + ‎-eus → ‎argenteus (“made of silver”)

   ‎ferrum (“iron”) + ‎-eus → ‎ferreus (“made of iron”)

   ‎marmor (“marble”) + ‎-eus → ‎marmoreus (“made of marble”)

   ‎pīnus (“pine tree”) + ‎-eus → ‎pīneus (“made of pine”)

First/second-declension adjective.

• -āceus
• -āneus
• -uleus

• Italian: -eo
• Portuguese: -eu
• Spanish: -eo
• → English: -eous

• From Ancient Greek -εῖος (-eîos), also from Proto-Indo-European *-e- +‎ *-yós. Compare with its inherited form (Etymology 1).
• From Ancient Greek -εῖος (-eîos), from Proto-Indo-European *-iH- +‎ *-wós. Compare with its inherited form -īvus.

• (Classical Latin) IPA^(key): [ˈeː.ʊs]
• (modern Italianate Ecclesiastical) IPA^(key): [ˈɛː.us]

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

1. In adopted Greek words, surviving thus or as -īvus.

   mūsēum (μουσεῖον (mouseîon), cf. mūsīvum from the same source)

First/second-declension adjective.

• “-eus” on page 628/3 of the Oxford Latin Dictionary (1st ed., 1968–82)

-eus

1. alternative form of -us