from The Century Dictionary and Cyclopedia
- n. Ethyl or amyl valerianate diluted with alcohol: used to imitate the odor of apples in confectionery and soda-water syrups. Also apple-essence.
Sorry, no etymologies found.
I found, besides the pear-oil, also an _apple-oil_, which, according to my analysis, is nothing but valerianate of amyloxide.
By oxidation with bichromate of potash and sulphuric acid, fusel oil yields valerianic acid, which is used in medicine, and apple-oil, employed as a flavoring ingredient in confectionery.