Lea

 
A lea is a pasture; a field covered with grass or herbage and suitable for grazing by livestock.

The curfew tolls the knell of parting day,
The lowing herd winds slowly o’er the lea,
(Elegy Written in a Country Churchyard by Thomas Gray)

Lea is also a unit of length of thread or yarn. And LEA is an abbreviation for lower extremity amputation or amputee.