Definition of sonar
: a method or device for detecting and locating objects especially underwater by means of sound waves sent out to be reflected by the objects; also : a device for detecting the presence of a vessel (as a submarine) by the sound it emits in water
Examples of sonar in a sentence
They detected the submarine by using sonar.
Origin and Etymology of sonar
sound navigation ranging
First Known Use: 1945
SONAR Defined for English Language Learners
Definition of sonar for English Language Learners
: a device used for finding things that are underwater by using sound waves
SONAR Defined for Kids
Definition of sonar for Students
: a device for detecting objects underwater using reflected sound waves
Seen and Heard
What made you want to look up sonar? Please tell us where you read or heard it (including the quote, if possible).