Plural of barbasco using the more direct Spanish plural form, referring to multiple barbasco plants or the substance.
This is the Spanish plural form of 'barbasco,' where Spanish adds '-os' to masculine nouns; it appears in English texts particularly those dealing with botanical or historical records of Amazonian trade.
Languages like English borrow the same word in multiple plural forms—'barbascos' (Spanish style) and 'barbascoes' (English style) both appear in English texts, which is why your dictionary might have both versions!
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