(geometry) Any of a certain family of graphs related to Keller's conjecture, such that the vertices of the Keller graph of dimension n are the 4ⁿ elements (m₁,...,mₙ) where each m is 0, 1, 2, or 3,...

The state or quality of being sombrous.

simple past tense and past participle of quid

A device that allows water to flow in one direction only through a culvert; it is used especially to drain surface water from coastal marshes at low tide