gyrfalcon . ( Of the Br. ant. ) girfalt, gerfalt, or of the prov. gerfalt, gerfalc , and those of the nórd. ( geirfalki , geiri , DART-shaped object, falki , Falcon, by the arrows of their plumage similar lists). 1. m. Falcon of large size, which ordinarily lives in Northern Europe. 2. m. outstanding person in any activity. U m in sent. irón. 3. m. ancient piece of artillery, species of little caliber culverin. 4. m. Colloq. Chief, authority. U m in sent. irón. 5. m. germ. Man steals or stealing.