Im*pon"der*a*ble (?), a. [Pref. im- not + ponderable: cf. F. impondérable.]

Not ponderable; without sensible or appreciable weight; incapable of being weighed.


© Webster 1913.

Im*pon"der*a*ble, n. Physics

An imponderable substance or body; specifically, in the plural, a name formely applied to heat, light, electricity, and magnetism, regarded as subtile fluids destitute of weight but in modern science little used.


© Webster 1913.

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