Definition of pecan
1 : a large hickory (Carya illinoinensis synonym C. illinoensis) that has roughish bark and hard but brittle wood and is widely grown in the warmer parts of the U.S. and in Mexico for its edible nut
2 : the wood of the pecan tree The hardwood floor was made of pecan.
3 : the smooth oblong thin-shelled nut of the pecan tree bought some pecans to make a pie
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