safety glassEnglishOxford New American Dictionarysafety glass /ˈsāftē ɡlas, ˈseɪfti ɡlæs / ▸ noun 1 glass that has been toughened or laminated so that it is less likely to splinter when broken. 2 (safety glasses) toughened glasses or goggles for protecting the eyes when using power tools or industrial or laboratory equipment.