: a microorganism (such as a bacterium or virus) especially when causing illness or disease. Don't bug me with petty details. His eyes were bugged with horror.

Insects are the most diverse group of animals, with more than a million described species; they represent more than half of all animal species. The insect nervous system consists of a brain and a …

2 days ago · How do you know you really have bed bugs and not fleas, beetles, or another insect invasion that you need to eradicate? Find out here what bugs look like bed bugs.

BUG definition: 1. a very small insect 2. an illness that is usually not serious and is caused by bacteria or a…. Learn more.

BUG meaning: 1 : a usually small insect often used before another noun; 2 : a usually mild illness (such as a cold) that can be passed from one person to another

A bug is a tiny hidden microphone that transmits what people are saying. There was a bug on the phone.

Any of an order (Hemiptera) of insects with sucking mouthparts and with forewings thickened toward the base, as a water bug or squash bug.

In the animal kingdom, the term “bug” is often used informally to refer to insects and other small arthropods. Insects alone make up the largest and most diverse group of animals on Earth, with over …

Definition of bug noun in Oxford Advanced American Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

Look up Bug or bug in Wiktionary, the free dictionary.