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Definition of potiron in US English:
potiron
noun
rareA kind of pumpkin, especially one with a flattened shape and orange skin.
Origin
Mid 17th century; earliest use found in John Evelyn (1620–1706), diarist and writer. From French potiron a kind of large champignon, a kind of pumpkin, of uncertain origin, perhaps (via medical usage) from post-biblical Hebrew piṭriyyāh mushrom.
