Milpa
From SUALEX
The word milpa (attested in English 1648 and in Spanish 1552 ([[Haugen, Jason D. 2009. Borrowed borrowings: Nahuatl loan words in English. Lexis: Journal in English Lexicology, (3).|Haugen 2009])) refers to corn fields/maize plantations, and comes from Nahuatl /mi:lpan/ "maize.plant-loc".
Nahuatl mi:l- "maize plant" comes from PCN *mɨra, in turn from PSUA *mura "maize tassel".
The locative ending -pan comes from the PSUA locative case suffix -pa.