n (countable) A tree of species (taxlink|Sassafras albidum|species) of the eastern United States and Asia having mitten-shaped leaves and red, aromatic heartwood.
n (countable) A tree of any species in the genusSassafras.
n (uncountable) The bark of the root of this plant, used for medicinal and (mostly historically) culinary purposes and formerly a main ingredient in root beer.