Sentence:  She looked out at the <WSD>corn</WSD> field , the great green deep acres of it rolled out like the sea in the field beyond the whitewashed fence bordering the grounds . 
Meaning of the word marked with <WSD> tags:  tall annual cereal grass bearing kernels on large ears: widely cultivated in America in many varieties; the principal cereal in Mexico and Central and South America since pre-Columbian times