A lens that is flat on one side and concave on the other.
Retro Words You’ll Probably Never Use AgainMost of these retronyms -- obsolete words and phrases -- are outdated technologies.
What Does 🤳 Selfie Emoji Mean?This emoji is used any time a selfie is ... so a lot. Particularly when it comes to posts discussing selfies, making fun of selfies, or when posting a selfie.
- planoconvex lens,
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.