• WordNet 3.6
    • n pieplant long pinkish sour leafstalks usually eaten cooked and sweetened
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Webster's Revised Unabridged Dictionary
    • n Pieplant (Bot) A plant (Rheum Rhaponticum) the leafstalks of which are acid, and are used in making pies; the garden rhubarb.
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Century Dictionary and Cyclopedia
    • n pieplant Garden-rhubarb, Rheum Rhaponticum: so named from its use for pies.
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In literature:

Rhubarb, or pieplant, as it is more commonly called, is one of the hardiest and at the same time a most delicious fruit.
"Trees, Fruits and Flowers of Minnesota, 1916" by Various
Pieplant was two feet high, and strawberries were almost ripe.
"The Trail of the Goldseekers" by Hamlin Garland