[fur-muh] 
| firm or solid earth; dry land (as opposed to water or air). |
| terra fir·ma (fûr'mə) n. Solid ground; dry land. [New Latin : Latin terra, earth + Latin firma, feminine of firmus, solid.] |
Dry land, as opposed to the sea: “After our stormy voyage across the Atlantic Ocean, we were relieved to set foot on terra firma.” From Latin, meaning “firm (or solid) ground.”