terra firma (n.)youdaoicibaDictYouDict[terra firma 词源字典]
c. 1600, "part of the Italian mainland ruled by Venice," from Modern Latin terra firma, literally "firm land," from Latin terra "earth, land" (see terrain) + firma, fem. of firmus "strong, steadfast" (see firm (adj.)). Meaning "the land" (as distinct from "the sea") is first attested 1690s. Hakluyt and Sandys also used English firm (n.) to mean "the firm land, the mainland, terra firma."[terra firma etymology, terra firma origin, 英语词源]