lubricant (n.) Look up lubricant at Dictionary.com
1828, probably from lubricant (adj.), or from Latin lubricantem.
lubricant (adj.) Look up lubricant at Dictionary.com
"reducing friction," 1809, from Latin lubricantem (nominative lubricans), present participle of lubricare "to make slippery or smooth," from lubricus "slippery; easily moved, sliding, gliding;" figuratively "uncertain, hazardous, dangerous; seductive," from PIE *sleubh- "to slip, slide" (see sleeve).