RhymeZone: crown graph definitions

Definitions of crown graph:

noun: (graph theory) An undirected graph with 2n vertices in the two sets { u₁, u₂, ..., uₙ } and { v₁, v₂, ..., vₙ } and with an edge from uᵢ to vⱼ whenever i ≠ j.

(Definitions from Wiktionary)