Ndũũma

n.

1. yams; starchy underground tubers cultivated as a food crop, traditionally grown in moist areas and valued for nutrition

Example: "Irio cia mũgĩkũyũ nĩ irĩkũ? Ni ngwacĩ, ndũũma,ikwa,ucuru,njahĩ,terere,managu,githeri na indo ingĩ." — What are Kikuyu foods?