rare. [f. L. terra earth + SPHERE: cf. planisphere.] = TELLURION.

1

1867.  Sci. Amer. XVII. 2 Nov., 279/1. Terrasphere.—Eleazer Root, Indianapolis, Ind.—This invention relates to improvements in the terrasphere, for which letters patent were granted on the 18th day of December, 1866.

2

1891–.  in American dictionaries.

3