1. noun /ɜːθ,ɝθ/
The astronauts saw the earth from the porthole.
b) Soil.
This is good earth for growing potatoes.
2. verb /ɜːθ,ɝθ/
a) To connect electrically to the earth.
That noise is because the amplifier is not properly earthed.
b) To bury.
Wikipedia foundation.