Oil for dressing the hair, generally perfumed.(noun)
The Century Dictionary (Public Domain)
Use "hair-oil" in a sentence
"Her camellia hair-oil treatment planted the seed of the cosmetics business in Korea."
"The comfortable armchair into which I had thrown myself bore as many scars as a veteran; the arms were gnashed, the back was overlaid with a thick, stale deposit of pomade and hair-oil from the heads of all his visitors."
"In an incredibly short space of time she examined all his outlying pockets, drawers, and letters; she inspected his socks and handkerchiefs in the top drawers; and on the dressing-table, his razors, shaving-strop, and hair-oil."