WordNet
birch oil
n. a liquid ester with a strong odor of wintergreen; applied externally for minor muscle and joint pain [syn: methyl salicylate, sweet-birch oil]
Usage examples of "birch oil".
It was originally made (artificial flavors have taken over now, of course) from a blend of birch oil and sassafras, the dried root bark of the sassafras tree.
The smell in my nostrils was old leather, still bearing the traces of birch oil.