Plural of curara; multiple preparations or samples of curara poison.
Regular English plural of curara. European researchers and pharmaceutical companies collected multiple samples for study, hence the plural form appears in scientific literature.
Early pharmacologists collected 'curaras' from different South American tribes and compared their potency—different tribes made it differently, with wildly varying strengths. This variation is why modern surgical curare had to be standardized before it was safe to use.
Complete word intelligence in one call. Free tier — 50 lookups/day.