Definition of "Tay"

Tay¹

proper noun
1. The longest river in Scotland, United Kingdom, originating on the slopes of Ben Lui and flowing eastwards through the city of Perth before becoming an estuary, the Firth of Tay.
  Quotations
  A Metro-Cammell diesel multiple-unit from Dundee approaches Perth on the single-line bridge over the Tay in July, 1961.
  1962 October, G. Freeman Allen, “The New Look in Scotland's Northern Division—II”, in Modern Railways, page 269, photo caption
2. A river in Lanark County, Ontario, Canada, a left tributary of the Rideau.
3. A township in Simcoe County, Ontario, Canada.

Tay²

proper noun
countable and uncountable, plural Tays
1. A surname.

Tay³

proper noun
countable and uncountable, plural Tays
1. A diminutive of the unisex given name Taylor.