síd

sí +‎ -d (possessive suffix)

• IPA^(key): [ˈʃiːd]

síd

1. second-person singular (single possession) possessive of sí

• síth

• IPA^(key): (nominative/vocative/accusative singular and dual) /sʲiːð/, (dative singular) /sʲiːðʲ/

From Proto-Celtic *sedos, *sīdos (“mound (inhabited by fairies)”), from Proto-Indo-European *sēds, *sed- (“seat”).

síd n (genitive síde, nominative plural síde)

1. fairy mound
   1. (in genitive, as attribute) of a fairy mound, fairy
   2. (by extension) wondrous, enchanting, charming, delightful
2. (in the plural) fairy people, fairies
   • c. 1050–1100, Fíacc’s Hymn, published in Thesaurus Palaeohibernicus (reprinted 1987, Dublin Institute for Advanced Studies), edited and with translations by Whitley Stokes and John Strachan, vol. II, p. 317, l. 41:

     For túaith Hérenn bái temel · túatha adortais síde

     On the folk of Ireland there was darkness: the peoples used to worship fairies.

• (fairy people): áes síde

• Middle Irish: side
  • Irish: sí

síd n (genitive síde, nominative plural síde)

1. peace, goodwill, peaceableness, a state or period of peace, a truce; peace terms; peacemaking, conciliation
2. peace-offering, compensation, atonement, indemnity, compact of peace
3. pardon, forgiveness
4. (of natural phenomena) peace, quietness, stillness

• “1 síd, síth (‘fairy mound’)” in Dictionary of the Irish Language, Royal Irish Academy, 1913–76.
• “2 síd, síth (‘peace’)” in Dictionary of the Irish Language, Royal Irish Academy, 1913–76.