Word parts sand + -er Pronunciation (US) IPA (key): /ˈsændɚ/ Noun Singular sander Plural sanders (countable) A sander is someone or something that sands wood or other material. (rail) A sander is a device that spreads sand on the rails in wet, snowy, icy, slippery conditions to improve traction. Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads