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appressorium

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ap⋅pres⋅so⋅ri⋅um

[ap-re-sawr-ee-uhm, -sohr-]
–noun, plural -so⋅ri⋅a [-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.

Origin:
1895–1900; < NL, equiv. to L appress(us) (see appressed ) + -ōrium -orium
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Based on the Random House Dictionary, © Random House, Inc. 2009.
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