lateral line
US /ˈlæt.ər.əl ˌlaɪn/
UK /ˈlæt.ər.əl ˌlaɪn/
1.
a system of sense organs found in aquatic vertebrates, mainly fish, used to detect movement and vibration in the surrounding water
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Fish use their lateral line to navigate in murky waters.
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The shark's lateral line system helps it detect prey from a distance.