lignin sulfonate

noun Chemistry.
  1. a brown powder consisting of a sulfonate salt made from waste liquor of the sulfate pulping process of soft wood: used in concrete, leather tanning, as an additive in oil-well drilling mud, and as a source of vanillin.
Also called lig·no·sul·fo·nate [lig-nuh-suhl-fuh-neyt] /ˌlɪg nəˈsʌl fəˌneɪt/.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018