DEET

noun

ˈdēt 

variants or deet

: a colorless oily liquid insect and tick repellent C₁₂H₁₇NO

For the best protection against both mosquitoes and ticks, the CDC recommends products containing DEET.

—Kiera Butler

A repellent with deet is considered the most effective against ticks.

—Robert H. Boyle

Word History

Etymology

probably from d. e. t., from di- + ethyl + toluamide (C₈H₉NO)

First Known Use

1961, in the meaning defined above

Medical Definition

deet

noun

ˈdēt 

often all capitalized

: a colorless oily liquid insect and tick repellent C₁₂H₁₇NO