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echinoderm
echinoid
echinus
echo
echo boomer
echo chamber
echo plate
echo quilting
echo sounder
echocardiogram
echocardiograph
echoencephalogram
echoencephalograph
echogram
echographia
echography
echoic
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echo sounder
ech·o sound·er (plural ech·o sound·ers)


noun 
Definition:
 
navigation device: a device used to ascertain water depth or to locate underwater objects by measuring the time taken for emitted sound waves to return from either the bottom or the object
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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