| caesium clock | |
| —n | |
| See also second a type of atomic clock that uses the frequency of radiation absorbed in changing the spin of electrons in caesium atoms | |
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| an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle. |
| a fool or simpleton; ninny. |
| caesium clock | |
noun | |
| an atomic clock based on the energy difference between two states of the caesium nucleus in a magnetic field |