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| the atomic number or neutron number of an exceptionally stable nuclide |
| a device that produces a nearly parallel, monochromatic, coherent beam of light by exciting atoms to a higher energy level and causing them to radiate |
acoustic a·cous·tic (ə-k&oomacr;'stĭk) or a·cous·ti·cal (-stĭ-kəl)
adj.
Of or relating to sound, the sense of hearing, or the perception of sound.
acoustics a·cous·tics (ə-k&oomacr;'stĭks)
n.
The scientific study of sound, especially of its generation, transmission, and reception.
acoustics (ə-k 'stĭks) Pronunciation Key
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