perfilograph

noun
per·​filo·​graph | \(ˌ)pərˈfīləˌgraf, -fil-, -rȧf\

Definition of perfilograph 

: an instrument for recording undulations in the bottom of a river or harbor channel

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History and Etymology for perfilograph

Latin per filum by means of a cord (from per by means of, through + filum cord, thread) + English -o- + -graph

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