Definition of insecticide
: an agent that destroys insects
Recent Examples of insecticide from the Web
The species has adapted to a common class of insecticide, rendering it useless.
People spray on tick repellents, treat their clothes with insecticide and even spray their yards.
At night, mix some of the insecticide Sevin in a sprinkler can and apply it to the nesting area to eliminate the bees.
Apply a systemic insecticide, preferably earlier in the season next year.
Use spinosad, an organic insecticide made from a type of soil-dwelling bacteria.
In Germany, where the bees are generally healthier, there was no noticeable harm to the bees from the insecticide.
The EPA approved a new Monsanto biotechnology last week: Corn seeds will be genetically modified to produce an insecticide that in turn kills pests (in this case, western corn rootworms) by disrupting their RNA.
This last step is called RNA interference, or RNAi, and the Environmental Protection Agency last week approved the first insecticide relying on it.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'insecticide.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
Origin and Etymology of insecticide
International Scientific Vocabulary
First Known Use: 1865See Words from the same year
INSECTICIDE Defined for English Language Learners
Definition of insecticide for English Language Learners
: a chemical substance that is used to kill insects
INSECTICIDE Defined for Kids
Definition of insecticide for Students
: a chemical used to kill insects
Seen and Heard
What made you want to look up insecticide? Please tell us where you read or heard it (including the quote, if possible).