Surrounding the earth; going around the world or surrounding the globe.
From Latin circum- 'around' + terranus 'of the earth' (from terra 'earth'). An archaic or poetic term for what we might now call circumnavigating or global.
This word was used in the age of exploration to describe circumterraneous voyages—journeys that went all the way around the world. It's a magnificent old word that evokes ships, maps, and the moment humans realized Earth was round.
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