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biogeographic regions (pl) (noun), no singular
References to areas of the world that contain recognizably distinct and special fauna, or animals, and plants.
heliocentric coordinates (pl) (noun), no singular
A rule for designating each point in space by a set of numbers that are relative to how far something is to the sun as a center.
This entry is located in the following units: centro-, centr-, centri-, kentro- (page 7) helio-, heli- (page 1)