collimator
noun
col·li·ma·tor ˈkä-lə-ˌmā-tər 
1
: a device for producing a beam of parallel rays (as of light) or for forming an infinitely distant virtual image that can be viewed without parallax
2
: a device for obtaining a beam (as of particles) of limited cross section
Word History
First Known Use
1865, in the meaning defined at sense 1
Medical Definition
collimator
noun
col·li·ma·tor ˈkäl-ə-ˌmāt-ər
: a device for obtaining a beam of radiation (as X-rays) of limited cross section
- perennial canker
- perennial European sow thistle
- perennial pea
- perennial peppercress
- perennial peppergrass
- perennial philosophy
- perennial phlox
- perennial ragweed
- perennial ryegrass
- perennial teeth
- perennially
- perennials
- perennibranch
- Perennibranchiata
- perennibranchiate
- perennibranchs
- Perennichordata
- perenties
- pereon
- quarrystone bond
- quart
- quart pot
- quartan
- quartans
- quartation