What is the meaning of Buckwheat?

An Asian plant, of the species Fagopyrum esculentum.

The fruit of this plant used as a pseudocereal.

Any of the wild buckwheats in the genus Eriogonum.

A slow and painful murder by the Mafia as a warning to others.

Curly hair of a black person.

Pubic hair.

Source: wiktionary.org