ACID [as-id] What it is: Substances with a pH value less than 7. The opposite of alkaline. VIDEOS RELATED TO THIS TERMRecognizing the Saboteur Inside Your HeadNail Form ApplicationGelish Cover Tips LEARN MORE TERMSSTICKERSSQUARE NAILPLASTIC PUSHERPARAFFINGEL PAINTGLITTERNAIL VARNISHVIRUSRHINESTONESNAIL ENHANCEMENTPOTASSIUM HYDROXIDECALLUS SOFTENERCHEMICAL REACTIONSECONDARY COLORSUV/LED GEL POLISHNAILYMPIA COMPETITIONSFRENCH MANICURESOAK-OFF GEL POLISHACRYLICCOLOR FADINGSTICKERSSQUARE NAILPLASTIC PUSHERPARAFFINGEL PAINTGLITTERNAIL VARNISHVIRUS PrevNext