disinfect

disinfect — verb

1. to apply a chemical substance to a surface or object in order to destroy germs,

1.verbtransitive / intransitiveB2
Definition

to apply a chemical substance to a surface or object in order to destroy germs, bacteria, or other microorganisms that can cause illness.

Example

Ziad used an antiseptic wipe to disinfect his cut finger before bandaging it.

collocation: disinfect a wound

The hospital staff disinfect all surgical instruments between each operation to prevent infection.

passive: be disinfected between uses

Common collocations
  • disinfect a wound
  • disinfect a surface
  • disinfect equipment
  • disinfect with bleach
  • disinfect with alcohol
  • disinfect with chlorine
Synonyms
  • sanitize

    similar in meaning but often refers to reducing germs to a safe level rather than killing all of them; common for food-contact surfaces

  • sterilize

    stronger; means killing ALL microorganisms including spores, usually through heat or high-pressure steam

  • decontaminate

    broader; can refer to removing harmful substances including chemicals and radiation, not just germs

Antonyms
  • contaminate

    to make something dirty or harmful by adding a dangerous substance or germs

  • infect

    to cause a person, animal, or surface to have a disease or harmful microorganisms

Grammar Patterns

disinfect + object

disinfect + object + with + substance

be disinfected

Usage Note

Distinguish from 'clean': disinfecting specifically targets germs and microorganisms, while cleaning removes dirt and grime but does not necessarily kill germs. A product labeled 'antibacterial' or 'disinfectant' is needed for disinfection.

Common Mistakes

I disinfected the floor by sweeping it.
I disinfected the floor by wiping it with a bleach solution.
sweeping removes dirt but does not kill bacteria; disinfecting requires a chemical agent that destroys germs.
Washing your hands with plain water disinfects them.
Washing your hands with soap and water or using hand sanitiser disinfects them.
plain water alone does not kill most bacteria and viruses.

2. to use a program, such as antivirus software, to find and remove a computer viru

2.verbtransitiveC1
Definition

to use a program, such as antivirus software, to find and remove a computer virus or other harmful code from a device or system.

Example

Harper downloaded an antivirus tool to disinfect her laptop after clicking a suspicious email link.

collocation: disinfect a computer / laptop

The IT technician ran several programs to disinfect the office network after the malware attack.

Common collocations
  • disinfect a computer
  • disinfect a device
  • disinfect a system
  • disinfect with antivirus software
  • disinfect a network
Synonyms
  • clean

    more general term; 'cleaning' a computer can refer to removing unwanted files, while 'disinfecting' specifically targets viruses and malware

  • scan

    checking for viruses without necessarily removing them; a scan is the first step, disinfecting includes removal

Grammar Patterns

disinfect + object

disinfect + object + with + program

be disinfected

Usage Note

Often used with technical terms as the object: system, network, device, drive. The passive construction ('the computer was disinfected') is particularly common in IT support contexts.

Common Mistakes

I disinfected my computer by deleting old files from the desktop.
I disinfected my computer by running a full antivirus scan.
deleting files does not remove viruses; a specialised security program must detect and eliminate the malicious code.

Word family

  • disinfectant
    nounB2
  • disinfectant
    adjectiveB2
  • disinfected
    adjectiveB2
  • disinfection
    nounC1
  • disinfecting
    adjectiveC1

Synonym discussion

Sense: verb/1

All four words involve making something free from harmful substances, but they differ in strength and context. 'Clean' is the broadest term and simply means removing dirt or unwanted matter; it does not guarantee germs are killed. 'Sanitize' reduces the number of germs to a safe level — commonly used for kitchen counters, dishes, or hand sanitisers. 'Disinfect' goes further by actively destroying germs and is the standard term for medical settings, wound care, and bathroom cleaning. 'Sterilize' is the strongest: it kills ALL microorganisms, including spores, and is used for surgical instruments and laboratory equipment (often via heat or steam). 'Decontaminate' is the widest in scope — it can refer to removing chemicals, radiation, or biological agents. For everyday home use, 'clean' then 'disinfect' is the typical two-step process: first remove dirt, then kill the remaining germs.

sanitizesterilizedecontaminateclean ↗

Common collocations

Nouns

Adverbs

Phrases

  • disinfect against germs
  • disinfect with a solution

Prepositions

Etymology

LatinFrenchEnglish

The word 'disinfect' comes from French 'désinfecter', which was formed by adding the prefix 'dés-' (meaning 'to remove or reverse') to 'infecter' ('to infect'). This French word traces back to Latin: the prefix 'dis-' (apart, away) combined with 'inficere' (to dip in, stain, or corrupt). Originally used for medical cleaning in the 16th century, the word gained its computing sense in the late 20th century as antivirus software became common.