an extensive grassy treeless plain, esp in South America 
WordReference Random House Learner's Dictionary of American English © 2025
lla•no /ˈlɑnoʊ, ˈyɑ-/USA pronunciation  
n. [countable], pl. -nos. (in the southwestern U.S. and Spanish America)
WordReference Random House Unabridged Dictionary of American English © 2025- Ecologya wide, long grassy plain with few trees.
 
lla•no 
(lä′nō; Sp. yä′nô),USA pronunciation n., pl. -nos (-nōz; Sp. -nôs).USA pronunciation (in the southwestern U.S. and Spanish America)
- Ecologyan extensive grassy plain with few trees.
 
- Latin plānus plain1
 - Spanish: a plain
 - 1605–15
 
Collins Concise English Dictionary © HarperCollins Publishers::
'llano' also found in these entries (note: many are not synonyms or translations):