Usage: 2 forms in 3 verses
Form Translated As     In Verse(s)
περιδέξιον right armband LXX.Num.31.50
περιδέξια right armbands LXX.Exod.35.22LXX.Isa.3.20

Liddell-Scott-Jones

περιδέξιος (peridexios) a right armband G:N-N

περιδέξιος, ον,

with two right hands, i.e. ambidextrous, [Refs 8th c.BC+]

__2 very dexterous or expert, λόγοι [Refs 5th c.BC+]. adverb -ξως [Refs 2nd c.AD+]
__3 convenient, [Refs 3rd c.AD+]
__4 δένδρον π., name of a fabulous Indian tree, [Refs 1st c.AD+]
__II going round the right arm:— substantive περιδέξιον, τς, armlet for the right arm, PPetr.2 Intr.p.22 [LXX+3rd c.BC+]

LSJ Scripture Refs: LXX.Exod.35.22LXX.Isa.3.20