Etymology
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pampas (n.)

"vast treeless plains of South America," 1704, from Argentine Spanish pampas, plural of pampa, from Quechua (Inca) pampa "a plain." Related: Pampean. Similar landscapes north of the Amazon are called llanos (see llano).

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Definitions of pampas

pampas (n.)
the vast grassy plains of northern Argentina;
From wordnet.princeton.edu