haustorium
noun
haus·to·ri·um hȯ-ˈstȯr-ē-əm 
plural haustoria hȯ-ˈstȯr-ē-ə
: a nutrient-absorbing outgrowth of a fungus or parasitic plant that penetrates the tissues of the host organism
Note: Haustoria arise from the hyphae in fungi and from the roots or stems of parasitic plants (such as dodder and mistletoe).
Word History
Etymology
New Latin, from Latin haurire
First Known Use
1875, in the meaning defined above
Medical Definition
haustorium
noun
haus·to·ri·um hȯ-ˈstōr-ē-əm, -ˈstȯr-
plural haustoria -ē-ə
: a food-absorbing outgrowth of a plant organ (as a hypha or stem)