/ · 1894 Brewer’s · I · Imponderables (Latin, things without weight)
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Heat, light, electricity, and magnetism were, it was at one time supposed, the phenomena of imponderable substances; that of heat was called caloric. This theory is now exploded, but the hypothetical ether is without appreciable weight.
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Entry taken from Dictionary of Phrase and Fable, edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.
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