Usage: 2 forms in 2 verses
Form Translated As     In Verse(s)
πυρσόσ signal-fire LXX.Judg.20.40
πυρσόν a signal-fire LXX.Judg.20.38

Liddell-Scott-Jones

πυρσός (pursos) a signal-fire G:N-M

πυρσός, ,

irregular plural πυρσά [Refs 5th c.BC+]: (πῦρ, πυρρός):—firebrand, torch, [Refs 8th c.BC+]: plural, fires, λίθος μήτηρ πυρσῶν [Refs 2nd c.AD+]; of lightning, Oracle texts cited in [Refs 5th c.BC+]: plural, of the fires of love, [Refs 3rd c.BC+]

__II beacon or signal-fire (= Attic dialect φρυκτός), [Refs 5th c.BC+]
__II.2 plural πυρσά, watchfires, [Refs 5th c.BC+]
__B πυρσός (B), , όν, see at {πυρρός}.