- Of uncertain stability; in a condition to pass into another phase when slightly disturbed, water, when cooled below the freezing point may remain liquid but will immediately congeal if a piece of ice is added.
- Denoting the excited condition of the nucleus of a radionuclide isomer that reaches a lower energy state by the process of isomeric transition decay without changing its atomic number or weight; Tc → Tc + γ.
[meta- + L. stabilis, stable]
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Examples: glitazone, GI cocktail, etc.