牛膝草 Traditional form: 牛膝草 Pinyin (reading): niúxīcǎo Definitions: hyssop (Hyssopus officinalis) Characters: 牛 - ox, cow, bull 膝 - knee 草 - grass, herbs; straw, thatch Traditional characters: 牛 - ox, cow, bull 膝 - knee 草 - grass, herbs; straw, thatch