Sentence:  These three plants are often grown together in a single field called a <WSD>milpa</WSD>, the beans creeping up the corn stalks while the squash plants catch along the lower leaves of the corn plants. 
Meaning of the word marked with <WSD> tags:  A small field, especially in Mexico or Central America, that is cleared from the jungle, cropped for a few seasons, and then abandoned for a fresh clearing.