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The Collaborative International Dictionary
Undersphere

Undersphere \Un"der*sphere`\, n.

  1. A sphere which is smaller than, and in its movements subject to, another; a satellite.

  2. An inferior sphere, or field of action.

Wiktionary
undersphere

n. 1 A sphere which is smaller than, and in its movements subject to, another; a satellite. 2 An inferior sphere, or field of action.