1. a half-crown—possibly from its rotundity. Also a long pipe.
2. a turkey; “ALDERMAN IN CHAINS,” a turkey hung with sausages.
John Camden Hotten. The Slang Dictionary (1913)
► uses
Uses:
An alderman about to be mayor must by-and-by enlarge his dinner-parties, but at present there were plenty of guests at his well-spread table.
George Eliot. Middlemarch
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Rail against plays, to please the alderman
Whose daily custard you devour;
Ben Jonson. The Alchemist (1610)
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the scarlet cloak which an elderly man looks as though he had put on to humour some whim in the painter is his gown as a professor or alderman or his cardinal’s cassock.