ACID [as-id] What it is: Substances with a pH value less than 7. The opposite of alkaline. VIDEOS RELATED TO THIS TERMQ&A with Dafne FernandezSarah PetersenHazel Dixon Nails HD One LEARN MORE TERMSMATTE NAILSSOAK-OFF GEL POLISHSOAK-OFF GELSNAIL BITINGMULTI-USE IMPLEMENTPOTASSIUM HYDROXIDEDIAMOND E-FILE BITSELECTRIC FILESTERILIZATIONACRYLATEACETONECOLORED POWDERDUST VACUUMACRYLIC BRUSHE-FILE BITPIGMENTEXTENSIONALMOND NAILSMANICURE BRUSHUV LAMP PrevNext