perfilograph

noun

per·​filo·​graph

(ˌ)pərˈfīləˌgraf,

-fil-,

-rȧf

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

Word History

Etymology

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

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