Chemistry: tending to decompose or change into other compounds.

Un*sta"ble (?), a. [Cf. Instable.]

Not stable; not firm, fixed, or constant; subject to change or overthrow.

-- Un*sta"ble*ness, n. Chaucer.

Unstable equilibrium. See Stable equilibrium, under Stable.

 

© Webster 1913.

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