What is "ensheathed"

Usage examples of "ensheathed".

It had been a night of iron frost and the tussocky pastures beyond the walls were held in a pitiless white grip with every blade of grass stiffly ensheathed in rime.

There were no pikes in evidence, but each man wore a sword and long dagger ensheathed upon his belt, and their features looked hard in the light of guttering tapers mounted at odd intervals upon the stone walls.