diathermal

Thence flow those natural conjectures, which are well worthy of experimental examination: all men do not see by the same rays; decided differences may exist in this respect in the same individual during various nervous states; it is possible that the calorific rays, the dark rays of one person, may be the luminous rays of another person, and reciprocally; the calorific rays traverse some substances freely, which are therefore called diathermal, these substances, thus far, had been called opaque, because they transmit no ray commonly called luminous; now the words opaque and diathermal have no absolute meaning.

Biographies of Distinguished Scientific Men Arago, Francois 1859

Thence flow those natural conjectures, which are well worthy of experimental examination: all men do not see by the same rays; decided differences may exist in this respect in the same individual during various nervous states; it is possible that the calorific rays, the dark rays of one person, may be the luminous rays of another person, and reciprocally; the calorific rays traverse some substances freely, which are therefore called diathermal, these substances, thus far, had been called opaque, because they transmit no ray commonly called luminous; now the words opaque and diathermal have no absolute meaning.

Biographies of Distinguished Scientific Men Baden Powell 1819

Physical therapy uses infrared rays, diathermal rays, heat, ultrasound, and a variety of things.

INAUGURATION OF SIX POLYCLINICS & HOME OF ELDERL 1989

Thus certain stones become both opaque and diathermal, and as the heat is caused to vary, so do they show the complete gamut between the two extremes of total opacity and complete transparency to heat-rays.

The Chemistry, Properties and Tests of Precious Stones John Mastin

So that all diathermal stones are easily permeable by radiant heat, which passes through them exactly as does light through transparent bodies.

The Chemistry, Properties and Tests of Precious Stones John Mastin

Heat passes through these as easily as does light through a diamond, such stones being classed as diathermal (to heat through).

The Chemistry, Properties and Tests of Precious Stones John Mastin