(adj) situated at or extending to great depth; too deep to have been sounded or plumbed; ; -Thomas Gray, Syn.unfathomed, unplumbed, unsounded, Example: the profound depths of the sea; the dark unfathomed caves of ocean; unplumbed depths of the sea; remote and unsounded caverns
(n) a measuring instrument that sends out an acoustic pulse in water and measures distances in terms of the time for the echo of the pulse to return, Syn.asdic, echo sounder, Example: sonar is an acronym for sound navigation ranging; asdic is an acronym for antisubmarine detection investigation committee
The Collaborative International Dictionary of English (GCIDE) v.0.53
n. One who, or that which; sounds; specifically, an instrument used in telegraphy in place of a register, the communications being read by sound. [ 1913 Webster ]
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