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Hexagraph

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A hexagraph (from the Greek: ἕξ, héx, "six" and γράφω, gráphō, "write") is a sequence of six letters used to represent a single sound (phoneme), or a combination of sounds that do not correspond to the individual values of the letters. They occur in Irish orthography, and many of them can be analysed as a tetragraph followed by the vowels e or i on either side to indicate that the neighbouring consonants are palatalized ("slender"). However, not all Irish hexagraphs are analysable that way. The hexagraph oidhea, for example, represents the same sound (approximately the vowel in English "write") as the trigraph adh, and with the same effect on neighboring consonants.

English does not have hexagraphs. The six-letter sequence schsch appears in German, for example in the name Eschscholtz (and thus is the scientific name Eschscholtzia of the California poppy), but this is a doubling of the trigraph sch to indicate that the preceding vowel is short rather than itself being a hexagraph.

List of hexagraphs

Irish hexagraphs 

Used between a palatalized ("slender") and a velarized ("broad") consonant:

  • eidhea⟩ and ⟨eighea⟩ are both used to write the sound /əi̯/. Some words with the first: eidheann "ivy", feidheartha "penniless". And the second: leigheas "healing", deideigheanna "soft toys", deighealfaidh "will divide".

Used between two slender consonants:

  • eabhai⟩ and ⟨eamhai⟩ are both used to write the sound /əu̯/, or in Donegal, /oː/. Some words with the first: breabhaid "sortie", deabhaidh "haste, skirmish", feabhais "improvement" (gen), leabhair "books", meabhair "minds". Words with the second: creamhaigh "garlic" (gen), sceamhaim "I bark", seamhain "semiology", sleamhain "slippery", teamhair "hill".
  • eadhai⟩ is used to write the sound /əi̯/, or in Donegal, /eː/. Some words with the hexagraph: feadhain "troop", Gairmleadhaigh "Gormley" (surname), ghleadhair "struck".

Used between two broad consonants:

  • oidhea⟩ and ⟨oighea⟩ are both used to write the sound /əi̯/. A word with the first is oidheanna "fates". Words with the second: Baoighealláin "Boylan" (surname), broigheall "cormorant", oigheann "oven", oighear "ice", poigheachán "(snail)shell".

See also

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Hexagraph
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