Acrylic/əˈkrɪlɪk/ Definition 1 of 3Pro Tip 1/3Versatile Material Acrylic is used in daily life for items like aquariums, eyeglass lenses, and signage. The shop's sign was made of shiny acrylic letters. Pro Tip 2/3Not Glass Acrylic may look like glass, but it's lighter and more impact-resistant. He replaced the glass in the picture frame with an acrylic sheet. Pro Tip 3/3Sensitivity Warning Acrylic can scratch easier than glass. Handle with care. She noticed the acrylic cover of her smartphone had scratched.