# midsphere

> English word · Noun

## Definitions
1. A middle sphere or region.
2. The sphere which, if it exists, is tangent to every edge of a given polyhedron and with respect to which the polyhedron's vertices are the inversion poles of the planes of the faces of its dual polyhedron (and vice versa).
3. The sphere, between two given spheres, by which each of the latter may be inverted into the other.
4. A supposed realm between earth and heaven.

## Etymology
From mid- + sphere.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/midsphere