sonar
UK[ˈsəʊ.nɑːr]US[ˈsoʊ.nɑːr]
n
a system for detecting objects under water by sending out sound waves and measuring the time they take to return
n
the equipment used in such a system
Etymology
the word 'sonar' is a 20th-century technological acronym, coined during world war ii from the phrase "sound navigation and ranging." it follows a pattern similar to 'radar' (radio detection and ranging), creating a concise, memorable term for a complex system. while 'sound' itself has old english and latin origins, and 'navigation' and 'ranging' derive from latin, 'sonar' functions as a unitary lexical item. its formation represents a modern method of word creation, where the literal descriptive phrase condenses into an abstract noun denoting the technology itself.
Analysis
this is a simplex word, an acronym formed from the initial letters of "sound navigation and ranging." it is not divisible into classical morphemes based on its english spelling.
Examples
the submarine used its sonar to map the ocean floor.
fishermen often rely on sonar to locate schools of fish.
the research vessel is equipped with advanced side-scan sonar.