An alternate or archaic spelling of cyanamide, a nitrogen-containing organic compound with applications in agriculture and chemical synthesis.
From cyanogen (meaning 'blue-producer') + -amide (a functional group in organic chemistry). This shortened form appeared in earlier chemical literature before standardized naming conventions were established.
Cyamid shows how chemistry has standardized its language—older chemists used many variations of the same compound names, which is why if you read 100-year-old chemistry papers, the vocabulary looks almost foreign compared to today's textbooks.
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