[ap-re-sawr-ee-uhm, -sohr-]
noun, plural appressoria [ap-re-sawr-ee-uh, -sohr-] . Mycology.
a flattened and thickened tip of a hyphal branch, formed by some parasitic fungi, that facilitates penetration of the host plant.

1895–1900; < Neo-Latin, equivalent to Latin appress(us) (see appressed) + -ōrium -orium Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
appressorium (ˌæprɛˈsɔːrɪəm)
n , pl -ria
botany a flattened hypha of a parasitic fungus that penetrates the host tissues
[from New Latin, from Latin appressus; see appressed]

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