Usage: 4 forms in 5 verses
Form Translated As     In Verse(s)
εξεγέλασαν they laughed out loud LXX.Neh.2.19
εξεγέλα he was laughing out loud LXX.Neh.4.1
εκγελάσεται derides LXX.Ps.2.4
shall laugh out loud at LXX.Ps.37.13
εκγελάσεισ shall laugh out loud at LXX.Ps.59.8

Liddell-Scott-Jones

ἐκγελάω (ekgelaō) to laugh out loud G:V

ἐκγελάω,

Epic dialect aorist ἐξεγέλασσα [Refs 3rd c.BC+]:—laugh out, laugh loud, ἡδὺ δ᾽ ἄρ᾽ ἐκγελάσας μετεφώνεε [Refs 8th c.BC+]: metaphorically of a liquid that rushes out with a gurgling sound, ἐκγελᾷ φόνος [Refs 5th c.BC+]