We don't have synonyms for amerindians yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are amerindian and meridians.
(adj) :
(linguistics) Of or relating to a hypothetical, largely discredited higher-level language family including all of the indigenous languages of the Americas, excluding those that belong to Eskimo-Aleut or Na-Dene.
(adj) :
(linguistics) Of or relating to a hypothetical, largely discredited higher-level language family including all of the indigenous languages of the Americas, excluding those that belong to Eskimo-Aleut or Na-Dene.