Plural of cyanid (archaic spelling); older term for cyanide compounds.
From cyanid + -s (plural marker). This represents the archaic plural form from when 'cyanid' was a common spelling.
Finding 'cyanids' in a Victorian-era chemistry textbook is like discovering how science vocabulary fossils itself in old literature—each generation uses slightly different terms, and tracing these changes shows the gradual standardization of scientific language.
Complete word intelligence in one call. Free tier — 50 lookups/day.