Definitions

1. adjective

relating to or situated on or near the line of the North or South Pole of the Earth

“The transpolar flight route spans across the entire Arctic region.”

2. noun

a line that passes through the North or South Pole of the Earth

“The transpolar axis runs through the center of the planet.”

3. adverb

in a direction towards or near the North or South Pole of the Earth

“The explorers traveled transpolar to reach the remote research station.”