lateral line organ
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|Noun||1.||lateral line organ - sense organs of fish and amphibians; believed to detect pressure changes in the water|
amphibian - cold-blooded vertebrate typically living on land but breeding in water; aquatic larvae undergo metamorphosis into adult form
fish - any of various mostly cold-blooded aquatic vertebrates usually having scales and breathing through gills; "the shark is a large fish"; "in the living room there was a tank of colorful fish"