WordReference Random House Unabridged Dictionary of American English © 2026
dif•frac•tom•e•ter
(di frak tom′i tər, dif′rak-),USA pronunciation n. [Physics.]
- Physicsan instrument that is used to study atomic crystal structure by measuring the angles at which x-rays, neutrons, or electrons are diffracted by matter.
- diffract + -o- + -meter 1905–10