14-Letter Words Containing: C,E,E,F,I,R,R

• A device that uses diffraction (especially X-ray diffraction) to investigate the structure of matter.

• the size of something as given by the distance around it

• the boundary line encompassing an area or object

• the length of the closed curve of a circle

• splitting a ray into two parallel rays polarized perpendicularly

• the physical property of a medium as determined by its index of refraction

• the physical property of a medium as determined by its index of refraction

• a military operation (often involving new supplies of men and materiel) to strengthen a military force or aid in the performance of its mission

• information that makes more forcible or convincing

• (psychology) a stimulus that strengthens or weakens the behavior that produced it

• a device designed to provide additional strength

• an act performed to strengthen approved behavior