a. [ Holo- + arctic. ] Of or pert. to the arctic regions collectively; specif. (Zoögeography), designating a realm or region including the northern parts of the Old and the New World. It comprises the Palearctic and Nearctic regions or subregions. [ Webster 1913 Suppl. ]

a. [ Holo- + Gr.&unr_;, &unr_;, shield. ] (Zool.) Having a single series of large scutes on the posterior side of the tarsus; -- said of certain birds. [ 1913 Webster ]