- dock, sorrel, sour grass - any of certain coarse weedy plants with long taproots, sometimes used as table greens or in folk medicine
--1 is a kind of herb, herbaceous plant
--1 is a member of Rumex, genus Rumex
--1 has particulars:sour dock, garden sorrel, Rumex acetosa; sheep sorrel, sheep's sorrel, Rumex acetosella; bitter dock, broad-leaved dock, yellow dock, Rumex obtusifolius; French sorrel, garden sorrel, Rumex scutatus