di·op·trics 
(dī-ŏptrĭks)
(dī-ŏptrĭks)n. (used with a sing. verb)
The study of the refraction of light.
- straight from the shoulder
- straight-from-the-shoulder
- straightjacket
- straightjacket
- straight-laced
- straight-laced
- straight-line
- straightly
- straight man
- straightness
- straight off
- straight-out
- straight poker
- straight razor
- straight shooter
- straight-shooting
- straight ticket
- straight up
- straightway
- strain
- strain
- strain at stool
- strained
- strainer
- strain every nerve