Definition of burning glass in English:

burning glass

noun

  • A lens for concentrating the sun's rays on an object so as to set fire to it.

    • ‘If a spherical glass vessel is filled with clear water, it acts like a round burning glass.’
    • ‘But the city was defended by Archimedes, a greater inventor, whose ‘burning glasses’ and other counter-engines destroyed the attackers' siege engines.’
    • ‘A glass bowl full of water had been used as a magnifier and burning glass in antiquity.’