a tree, Alnus oregona (or A. rubra), of western North America, having smooth, mottled light gray bark and oval serrate leaves.
the hard, red wood of this tree, used for making furniture.
Origin of red alder
First recorded in 1905–10
Related formsred-al·der, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019