boletusPronunciation: /bəˈliːtəs/ (also bolete)Definition of boletus noun (plural boletuses) a toadstool with pores rather than gills on the underside of the cap, typically having a thick stem. Genus Boletus, family Boletaceae, class Hymenomycetes Origin:from Latin, from Greek bōlitēs, perhaps from bōlos 'lump'boletus in other Oxford dictionaries Definition of boletus in the US English dictionary