A person who compiles, writes, or works on an encyclopedia; someone devoted to the comprehensive study or documentation of knowledge.
From encyclopedia + -ian suffix (indicating a person). This term specifically identifies someone professionally engaged with encyclopedic work, emerging in the 18th century with the Great Encyclopédie project.
Denis Diderot and his collaborators on the French Encyclopédie were the original 'encyclopaedians,' and they were actually radical revolutionaries disguising political ideas in definitions!
Complete word intelligence in one call. Free tier — 50 lookups/day.