Derived fromProto-Indo-European*-yós.

-ῐος• (-ĭos) m (feminine-ῐ́ᾱ,neuter-ῐον);first/second declension

1. Suffix added to nouns or adjectives, forming adjectives: pertaining to, belonging to ("of").
   1. Often added to a combination of preposition and noun (parasynthesis)

      ἀπό-γε-ιος

      apó-ge-ios

      far from earth (adj.)

• -ιον(-ion,diminutives and nominalized adjectives)

• Greek:-ιος(-ios)

• Smyth, Herbert Weir (1920), “Part III: Formation of Words”, inA Greek grammar for colleges, Cambridge: American Book Company,§ 858.2

FromAncient Greek-ῐος(-ĭos). Found in inherited words, and compositions of formal words.

for older or formal words:

• IPA^(key): /i.os/
• Hyphenation:ι‧ος

-ιος• (-ios) m (feminine-ια,neuter-ιο)

1. Used to formnouns andadjectives indicatingorigin:

   ‎Κύπρος(Kýpros,“Cyprus”) + ‎-ιος(-ios) → ‎Κύπριος(Kýprios,“Cypriot”)(noun, demonym)

   Related term:-αίος(-aíos) fordemonyms

   ‎θάλασσα(thálassa,“sea”) + ‎-ιος(-ios) → ‎θαλάσσιος(thalássios,“marine”)(adjective)

   ‎αιώνας(aiónas,“century”) + ‎-ιος(-ios) → ‎αιώνιος(aiónios,“eternal”)(adjective)

Modern formations of derivatives from verbs or adjectives +-ιος(-ios)

in one syllable:

• IPA^(key): /i̯os/ withpalatal variants/ʝos, ʎos, ços, ɲos/ depending on the preceding consonant
• Hyphenation:ιος

-ιος• (-ios) m (feminine-ια,neuter-ιο)

1. Used to formadjectives indicatingproperty,characteristic of the prototype word:

   ‎σαπίζω(sapízo,“to rot”) + ‎-ιος(-ios) → ‎σάπιος(sápios,“rotten”)/ˈsapços/(from verb)

   ‎καθαρός(katharós,“clean”) + ‎-ιος(-ios) → ‎καθάριος(kathários,“clear”)/kaˈθaɾʝos/(from adjective)

• -ειος(-eios)

• -ιός(-iós)

• "-ιος", in Λεξικό της κοινής νεοελληνικής [Dictionary of Standard Modern Greek], Triantafyllidis Foundation, 1998 at theCentre for the Greek language

• Ancient Greek terms derived from Proto-Indo-European
• Ancient Greek 2-syllable words
• Ancient Greek terms with IPA pronunciation
• Ancient Greek lemmas
• Ancient Greek suffixes
• Ancient Greek unaccented terms
• Ancient Greek adjective-forming suffixes
• Ancient Greek masculine suffixes
• Ancient Greek terms with usage examples
• Greek terms derived from Ancient Greek
• Greek terms with IPA pronunciation
• Greek lemmas
• Greek suffixes
• Greek masculine suffixes
• Greek adjectives in declension ος-α-ο-2
• Greek adjectives in declension ος-α-ο

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