occurring in both hemispheres of the brain or body
• (a.) Extending over all the zones, from the tropics to the polar zones inclusive.
Am`phi·ge'an adjective [ Greek ... + ..., ..., the earth.] Extending over all the zones, from the tropics to the polar zones inclusive. 
Of both worlds, the Old and New; said of distribution of plants.
amphigean 1. A reference to a plant that has underground as well as aerial flowers. 2. Extending all over the earth from the equator to both poles.