biconvex
/bʌɪˈkɒnvɛks
/adjective
Convex on both sides.The crystalline lens, which provides approximately 30% of the refractive power, is biconvex and has the ability to change its shape to increase or decrease its focusing power....
- Their molds demonstrate that lenses were numerous, biconvex, hexagonal in outline and arranged in an hexagonal close-packing system.
- The posterior chamber is separated from the vitreous body by a transparent biconvex lens.
- keep someone guessing
- keep someone in
- keep someone in countenance
- keep someone in his (or her) place
- keep someone off
- keep someone posted
- keep someone sweet
- keep someone/thing off
- keep someone/thing on
- keep someone under
- keep someone up
- keep something back
- keep something dark
- keep something down
- keep something from
- keep something in
- keep something quiet (or keep quiet about something)
- keep something to oneself
- keep something under one's hat
- keep something up
- keep step
- keep tabs (or a tab) on
- keep the ball rolling
- keep the bastards honest
- keep the field