Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

  

English definition of “bug”

bug

noun [C] (INSECT)   /bʌɡ/
an insect : Some tiny white bugs had eaten the leaves of my house plants . A bug is also a small organism that causes an illness : The flu bug is going around, and almost everyone is sick .
(Definition of bug noun (INSECT) from the Cambridge Academic Content Dictionary © Cambridge University Press)
Focus on the pronunciation of bug

Browse related topics

You are looking at an entry to do with General & informal words for animals, but you might be interested in these topics from the Animals generally topic area:

Definitions of “bug” in other dictionaries

Word of the Day

amicable

relating to behaviour between people that is pleasant and friendly, often despite a difficult situation

Word of the Day

Blog

Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More