SINCE 1828

An Encyclopædia Britannica Company

Medical Dictionary

dirofilariasis

noun di·ro·fil·a·ri·a·sis \ -ˌfil-ə-ˈrī-ə-səs \

medical Definition of dirofilariasis

plural dirofilariases play \-ˌsēz\

:infestation with filarial worms of the genus Dirofilaria and especially with the heartworm (D. immitis)

Seen and Heard

What made you want to look up dirofilariasis? Please tell us where you read or heard it (including the quote, if possible).

show

WORD OF THE DAY

euphony

play

pleasing or sweet sound

Words at Play

alt-59e50f5a357b4

'Spox' May Go On The Record

From newsroom lingo to the mainstream

alt-59e506c5c02ae

C'mon, Of Course 'Myriad' Is a Noun

For a myriad of reasons

alt-59e12097b419d

'Gamut' and 'Gambit' (and 'Gauntlet' Too)

Know when to use (or run) each.

17 English Words that Come From Japanese

Some borrowed words don't get returned

Ask the Editors

video-title-words-of-the-year-1066

Words of the Year: 1066

Or, Why Pig Meat is Called 'Pork' and Cow Meat is Called 'Beef'

How Often Is 'Biweekly'?

Don't get us started on 'bimonthly'

video-irregardless-grammar-peeve-blend-of-the-synonyms-irrespective-and-regardless

Irregardless

It is in fact a real word (but that doesn't mean you should use it).

video-moose-goose-weird-plurals

Weird Plurals

One goose, two geese. One moose, two... moose. What's up with that?

Word Games

knupfer-painting-solon-before-croesus

Forms of Government Quiz

Name that government! Or something like that.

Take the quiz

rembrandt-painting-a-young-scholar-and-his-tutor

Original Meanings Quiz

A quiz for the pedantic and those annoyed by them!

Take the quiz

Name That Thing

Name That Thing

Test your visual vocabulary with our 10-question challenge!

Take the quiz

SCRABBLE® Sprint

SCRABBLE® Sprint

SCRABBLE® fans, sharpen your skills!

Play the game