Definitions

1. adjective

relating to or denoting the combined Holarctic and Ethiopian realms of the Palearctic and Ethiopian zoogeographic realms, or the Holarctic and Afrotropical realms of the Holarctic and Afrotropical biogeographic realms

“The holarctic distribution of the species indicates its adaptability to diverse environments.”

2. noun

the combined Holarctic and Ethiopian realms of the Palearctic and Ethiopian zoogeographic realms, or the Holarctic and Afrotropical realms of the Holarctic and Afrotropical biogeographic realms

“The holarctic region is home to a wide variety of flora and fauna.”