a much thickened underground part of a stem or rhizome, e.g. in the potato, serving as a food reserve and bearing buds from which new plants arise 块茎 ■a tuberous root, e.g. of the dahlia 块根
(Anatomy)a rounded swelling or protuberant part (剖)结节,隆起,肿胀
语源
mid 17th cent.: from Latin, literally hump, swelling'