Third-person singular simple present indicative form of slenderize.(verb)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "slenderizes" in a sentence
"Firm support slenderizes and provides spinal support."
"This utility slenderizes your photo library by eliminating duplicate photos, removing backups of rotated or modified photos, stripping out your photos 'thumbnail icons, and locating and disposing of photos never added to an album."