Noun
Old Tom (uncountable)
(historical) A kind of strong gin popular in 18th-century England.
A recipe for a John Collins is featured in the Steward and Barkeeper's Manual of 1869: Teaspoonful of powdered sugar The juice of half a lemon A wine glass of Old Tom Gin A bottle of plain soda Shake up, or stir up with ice. Source: Internet
Other terms, such as “London dry gin,” “Hollands gin” and “Old Tom Gin” do indeed have important connotations within the gin world, but they don’t have specific legal definitions of their own in the U.S. We’ll explain each of them in more detail below. Source: Internet