/ap're sawr"ee euhm, -sohr"-/ , n. , pl. appressoria /-sawr"ee euh, -sohr"-/ . Mycol.
a flattened and thickened tip of a hyphal branch, formed by some parasitic fungi, that facilitates penetration of the host plant.
[ 1895-1900; appress ( us ) (see APPRESSED) + -orium -ORIUM ]