'long-beaked' originates from a combination of English elements: 'long' (from Old English 'lang', where the root meant 'long/length') and 'beak' (from Old French 'bec', where it meant 'bill, beak'), with the adjectival/past-participial suffix '-ed' from Old English.

'long' comes from Old English 'lang' and ultimately Proto-Germanic *langaz; 'beak' entered English via Old French 'bec' (from Late Latin/vernacular forms such as 'beccus'), and in Modern English the two were combined with '-ed' to form the compound adjective 'long-beaked' describing something that has a long beak.

Initially the components referred separately to 'long' and 'beak'; over time they formed the compound adjective meaning 'having a long beak'.