Word Study
holarctic
CIDE DICTIONARY
holarctic, a. [Holo- + arctic.].
Of or pert. to the arctic regions collectively [Webster 1913 Suppl.]
OXFORD DICTIONARY
holarctic, adj. of or relating to the geographical distribution of animals in the whole northern or arctic region.
Etymology
HOLO- + ARCTIC
For further exploring for "holarctic" in Webster Dictionary Online