noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   The finite topological space X consisting of four distinct points { a, b, c, d } with the non-Hausdorff topology a,b,c,d,a,b,c,a,b,d,a,b,a,b,∅.

Etymology

From pseudo- + circle.

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.