- a yellow, thin, water-insoluble liquid obtained from the sperm whale, used chiefly as a lubricant in light machinery, as watches, clocks, and scientific apparatus.
Origin of sperm oil
First recorded in 1820–30
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- an oil obtained from the head of the sperm whale, used as a lubricant