What does Rhubarb mean?

What does Rhubarb mean? So many meanings of ...
Rheum rhabarbarum, Rhubarb is a species of plant in the family Polygonaceae. They are herbaceous perennials growing from short, thick rhizomes. They have large leaves that are somewhat triangular, with long fleshy petioles. They have small flowers grouped in large with leafy greenish white to rose red inflorescences. Rhubarb is grown primarily for its fleshy stalks, technically known as petioles.
Rhubarb leaves contain poisonous substances.
In culinary use, fresh raw petioles (leaf stalks) are crisp (similar to celery) with a strong, tart taste. Most commonly, the plant's leaf stalks are cooked with sugar and used in pies and other desserts.
Any of a genus (Rheum) of Asian plants of the buckwheat family having large leaves with thick succulent petioles often used as food; also the petioles of rhubarb.
The dried rhizome and roots of any of several rhubarbs grown in China and Tibet and used as a purgative and stomachic.
Any of several plants of the genus Rheum, especially
R. rhabarbarum, having long green or reddish acidic leafstalks that are edible when sweetened and cooked. Also called pie plant.
Rhubarb is usually considered to be a vegetable; however, in the United States, a New York court decided in 1947 that since it was used in the United States as a fruit. Rhubarb has been used for medical purposes by the Chinese for thousands of years.