viral

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/ˈvaɪrəl/
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A quality of being caused by a virus, and, by extension, the rapid spread of something—especially digital content—across the internet.
Practice using this word in conversation

Examples

  • A viral tweet can change public opinion overnight.
  • The outbreak was caused by a viral pathogen.
  • Their marketing campaign went viral, reaching millions.
  • The meme became viral after just a few hours.
  • The patient was diagnosed with a viral infection.

Similar words

trending
infectious
memetic
spreading
popular
catchy
widely-shared
buzzworthy
communicable
contagious

Meanings

Relating to a virus

adjective
medical
neutral
Describing a disease or condition that is caused by a virus and can be transmitted between hosts.

Usage

Use viral for medical contexts when describing virus‑related conditions.

Examples

  • The patient was diagnosed with a viral infection.
  • Doctors prescribed antiviral medication for the viral illness.
  • A viral rash appeared on his arms after exposure.
  • She tested negative for viral hepatitis.
  • The outbreak was caused by a viral pathogen.
  • Researchers studied the viral genome to develop a vaccine.

Common mistakes

Mixing the term with unrelated illnesses or using it as a noun.
IncorrectCorrect
She caught a viral flu. She caught a viral infection.
He has a viral cold. He has a viral infection.
The doctor gave me a viral. The doctor gave me antiviral medication.
Viral diseases are not contagious. Viral diseases are contagious.

Similar words

infectious
contagious
pathogenic
epidemic
transmissible
communicable
spreading

Spread quickly and widely online

adjective
technology
informal
Describing content that becomes popular rapidly through sharing on the internet, especially on social media platforms.

Usage

Use viral for online content that spreads quickly and widely.

Examples

  • The meme became viral after just a few hours.
  • Their marketing campaign went viral, reaching millions.
  • A viral tweet can change public opinion overnight.
  • The video went viral, racking up thousands of views.
  • He hopes his song will go viral on TikTok.
  • The challenge turned viral, spreading across platforms.

Common mistakes

Confusing popularity with virality and misusing the term in non‑digital contexts.
IncorrectCorrect
The song is viral because it's popular. The song is viral because it spread rapidly online.
Our product went viral after the TV ad. Our product went viral after being shared on social media.
He made a viral joke. He made a viral joke that was widely shared.
The article is viral, but no one read it. The article is viral, meaning many people have read and shared it.

Similar words

trending
buzzworthy
widely-shared
memetic
catchy
popular

Usage

Use viral for medical contexts when describing virus‑related conditions, and for online content that spreads quickly and widely.

Common mistakes

Calling a popular song ‘viral’ when it has not spread rapidly online.

Etymology

From Latin virus ‘poison, slime’ + the suffix -al, recorded in English in the mid‑20th century.

FAQ

What does viral mean in medicine?

Viral describes diseases or conditions that are caused by a virus and can be transmitted between people.

How is viral used to describe online content?

When a piece of content spreads quickly and widely on the internet, especially through social media, it is called viral.

Can viral be used as a noun?

No, viral is an adjective; the noun form is virality.

Is viral always negative?

Not at all; in medical contexts it can be neutral, while in online contexts it often has a positive connotation of popularity.

What is the difference between viral and contagious?

Viral refers specifically to something caused by a virus, whereas contagious can describe any disease that spreads easily, viral or not.

When did viral first appear in English?

The adjective viral is first recorded in the mid‑20th century, derived from Latin virus plus the suffix ‑al.

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