Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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depth charge a device set to explode under water, used esp. against submarines.
depth perception the ability to perceive spatial relationships such as the relative distance of objects from one another or from the observer.
depth psychology the psychological study of the unconscious mind.
in depth in a thorough way.
in-depth thorough and detailed.
sonic depth finder an instrument that uses sonar to measure underwater depths.