• enPR: tā, IPA: /teɪ/

tay (plural tays)

1. (obsolete) The outer membrane of the brain.
   • a. 1472, Thomas Malory, “Capitulum 4”, in [Le Morte Darthur], book XXI, [London: […] by William Caxton], published 31 July 1485, OCLC 71490786 ↗; republished as H[einrich] Oskar Sommer, editor, Le Morte Darthur […], London: Published by David Nutt, […], 1889, OCLC 890162034 ↗:

     ryght so he smote hys fadir, Kynge Arthure, with hys swerde holdynge in both hys hondys, uppon the syde of the hede, that the swerde perced the helmet and the tay of the brayne.

tay (plural tays)

1. (obsolete or dialect) Tea.

1. A township in Ontario, Canada
2. The longest river in Scotland, at 188 km; it originates on the slopes of Ben Lui in the north-west of the country, and flows eastwards through the city of Perth before becoming an estuary, the Firth of Tay. Its estuary separates the north of Fife from the city of Dundee, and flows into the North Sea.