Definition of lactarius in US English:

lactarius

noun

  • A large woodland mushroom with a concave cap, the flesh exuding a white or colored milky fluid when cut.

    Genus Lactarius, family Russulaceae, class Hymenomycetes: several species, including the edible orange milk lactarius (L. deliciosus)

    • ‘Delicious lactarius is a common forest mushroom that exudes an orange-red juice when cut.’

Pronunciation

lactarius

/ˌlakˈterēəs/