lagumbayan noun English. A tall weed (1.5 m.) characteristic of cleared fields and new forest, having fragrant roots used in making rice-wine starter. Example sentence: Subanen. Alap mu lagumbayan pegdautu di tapay, pu' nda'idun ig lempi'. English. Get some lagumbayan tree root to flavor the rice wine starter with, for we have no root of the lempi' tree. Generic. sigbet