What does rhubarb mean in cooking?

rhubarb means: Celery-like vegetables are considered fruits, but a court decision once ruled that they were. The leaves of rhubarb are poisonous and should not be eaten. (in Cooking Dictionary)

What else does rhubarb mean?

• One of many plants in the genus Rheum, Particularly R. rhabarbarum, Having long, edible reddish or green leafstalks. These are often cooked and sweetened. (in Merlin Dictionary)
• Preparation made with the roots and rhizomes of various plants in the genus Rheum, Particularly R. palmatum Or R. officinale East Asia used to laxative. (in Merlin Dictionary)
• Unrest, fight or heated discussion. (in Merlin Dictionary)