n. One of several species of the genus Rumex, smaller plants than the docks of the same genus, having the leaves typically halberd-shaped, more or less succulent, and impregnated with oxalic acid.n. A plant of the genus Oxalis, more properly called wood-sorrel (see cuts under Oxalis and obcordate): the name is also extended to other plants of different genera (see phrases)n. The sheep-sorrel: probably from the red male inflorescence.Of a yellowish-or reddish-brown color.n. A color between a reddish and a yellowish brown.n. An animal of a sorrel color; especially, a sorrel horse.n. A buck of the third year. Compare sore, n., 2.