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plural polymaths
A person with extraordinarily broad and comprehensive knowledge. quotations examples
To be thought and held Polumathes and Polihistors.
1624, Robert Burton, The Anatomy of Melancholy (2nd edn.), p.6
A bit of a polymath, he was crucial in the early development of the railways in this country.
2021 December 29, Stephen Roberts, “Stories and facts behind railway plaques”, in RAIL, number 947, page 56