The term Gallowglass or Galloglass is an Anglicisation of the Irish, Gallóglaigh ("foreign soldiers"), incorporating the Celtic word Óglach, which is derived from oac, the Old Irish for "youths", but later meaning "soldier". Encarta specifies the plural of Gallowglass to be 'Gallowglasses', but this article assumes that the singular and plural terms are both 'Gallowglass', as the English term is derived from an Irish plural. Shakespeare uses the form "gallowglasses" in the play Mac… (More on Gallowglass)