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di·ro·fil·a·ri·a·sis | \ -ˌfil-ə-ˈrī-ə-səs 
\
\ plural dirofilariases\ -ˌsēz \
\Medical Definition of dirofilariasis
: infestation with filarial worms of the genus Dirofilaria and especially with the heartworm (D. immitis)
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