An older or alternative spelling of cyanide, a compound containing a cyano group (carbon and nitrogen bonded together).
From cyano- + -id (chemical suffix). This is an archaic spelling that appears in older chemistry texts before 'cyanide' became the standard form.
Finding 'cyanid' in old chemistry textbooks is like reading a snapshot of how scientific terminology evolves—scientists eventually standardized on 'cyanide' because consistency matters when people's safety depends on understanding chemical names.
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