or·tho·scop·ic 
(ôr′thə-skŏpĭk)
(ôr′thə-skŏpĭk)adj.
1. Having normal vision; free from visual distortion.
2. Giving an undistorted image. Used of an optical instrument.
- knocker
- knock for a loop
- knock it off
- knock-knee
- knock-kneed
- knock off
- knockoff
- knock out
- knockout
- knock out of the box
- knock socks off
- knock (someone's) socks off
- knock someone's socks off
- knock some sense into
- knock/throw for a loop
- knock together
- knock up
- knockwurst
- knockwurst
- knoll
- knoll
- knop
- Knossos
- knot
- knot