What is "photogravures"

Usage examples of "photogravures".

Those brown-toned photogravures dis­played faces that looked as if they 'd had a very tough time but would never break under the strain.

He looked at the walls hung with sentimental photogravures, at the shiny bronze "nudes," the moth-eaten animal-skins and the bedizened bed-and once more the unreality, the impossibility, of all that was happening to him entered like a drug into his veins.