moonlighter noun5 •A person who moonlights, working a second job on the side. •A moonshiner, who makes illicit alcohol. •(Ireland, historical) One of a gang who used violence, especially at night, to promote agrarianism in Ireland during the Land War of the late 19th century. •(US) One who serenades by moonlight. •(Australia) A southern Australian marine fish, Tilodon sexfasciatum. formsmoonlighters