deirfiúr

• deirbhshiúr (obsolete)
• driofúr (nonstandard)

From Old Irish derbṡiur, from derb (“certain”) +‎ siur (“sister”), from Proto-Celtic *swesūr, from Proto-Indo-European *swésōr.

• (Kerry) IPA^(key): /dʲɾʲəˈfˠuːɾˠ/^[1] (as if spelled driofúr)
• (Cork) IPA^(key): /dʲɾʲəˈfʲuːɾˠ/ (as if spelled drifiúr, only some speakers)
• (Waterford) IPA^(key): /dʲɛɾʲəˈfˠuːɾˠ/ (as if spelled deiriofúr)
• (Aran) IPA^(key): /ˈdʲɾʲauhəɾˠ/^[2] (as if spelled dreabhthar), (less often) /ˈdʲɾʲɛhuːɾˠ/^[3] (as if spelled dreithiúr)
• (Cois Fharraige) IPA^(key): /ˈdʲɾʲauɾˠ/ (as if spelled dreabhar)
• (West Connemara, South Mayo) IPA^(key): /ˈdʲɾʲɛhuːɾˠ/ (as if spelled dreithiúr)
• (Achill, Ulster) IPA^(key): /ˈdʲɛɾʲəfʲəɾˠ/^[4] (as if spelled deirfear)
• (Erris) IPA^(key): /ˈdʲɛɾʲəhuːɾˠ/ (as if spelled deirthiúr)

deirfiúr f (genitive singular deirféar, nominative plural deirfiúracha)

1. sister

• deartháir (“brother”)

• deirfiúirín m (“heath milkwort”)

• siúr

• Ó Dónaill, Niall (1977) “deirfiúr”, in Foclóir Gaeilge–Béarla, Dublin: An Gúm, →ISBN
• Gregory Toner, Sharon Arbuthnot, Máire Ní Mhaonaigh, Marie-Luise Theuerkauf, Dagmar Wodtko, editors (2019), “derbsiur”, in eDIL: Electronic Dictionary of the Irish Language