hydrophone

The word 'hydrophone' is a modern scientific compound, directly assembled from two classical Greek roots to precisely describe its function. The first element, hydro-, derives from the Greek hydōr (water), a word of Proto-Indo-European origin related to the concept of wetness or fluid. The second element, -phone, comes from Greek phōnē (sound, voice), from a PIE root meaning 'to speak' or 'to make a sound'. When combined in the late 19th century, these morphemes logically create the meaning 'water sound device', perfectly capturing the instrument's purpose of converting underwater acoustic vibrations into electrical signals, analogous to how a microphone operates in air.

Structure: hydro (water) + phone (sound) 'hydro' originates from Greek hydōr (water), functioning as a combining form meaning 'water' or 'liquid'. 'phone' originates from Greek phōnē (sound, voice), functioning as a combining form meaning 'sound' or 'voice'.