Usage: 2 forms in 2 verses
Form Translated As     In Verse(s)
έξαλλον a special LXX.2Sam.6.14
έξαλλοι are special LXX.Esth.3.8

Liddell-Scott-Jones

ἔξαλλος (exallos) special G:A

ἔξαλλος, ον,

special, distinguishing, ἐσθῆτες [LXX+2nd c.BC+]; στολαί [Refs 1st c.AD+] adverb -ως strangely, of superstitious veneration, [Refs 2nd c.BC+]

LSJ Scripture Refs: LXX.2Kgs.6.14