Sindarin 

gwaith-i-mírdain

proper name. People of the Jewel Smiths

The Elves in Eregion led by Celebrimbor in the Second Age, translated “People of the Jewel Smiths” (S/286). This name is a combination of gwaith “people”, the elided plural definite article of i “the” and the plural of otherwise unattested mírdan “jewel smith” (SA/gwaith, mîr).

Elements

WordGloss
gwaith“people; region, people, [ᴱN.] men, folk; [N.] manhood; man-power, troop of able bodied men, host, regiment; [S.] region”
i“the”
mírdan“jewel smith”
Sindarin [S/286; SA/gwaith; SA/mîr; SI/Gwaith-i-Mírdain; UTI/Gwaith-i-Mírdain] Group: Eldamo. Published by