Definition of marble gall in English:

marble gall

noun

  • A hard spherical gall which forms on the common oak in response to the developing larva of a gall wasp.

    • ‘The oak marble gall is frequently confused with the oak apple gall, caused by another gall wasp, Biorhiza pallida.’
    • ‘The marble gall, a green or brown growth about 2.5 cm (1 inch) in diameter, is caused by Andricus kollari.’