HYDROG'RAPHY, noun [Gr. water, and to describe.] The art of measuring and describing the sea, lakes, rivers and other waters; or the art of forming charts, exhibiting a representation of the sea coast, gulfs, bays, isles, promontories, channels, soundings, etc.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI