topsail

Short definition from Wiktionary

Noun

1. 1
   A sail or either of the two sails rigged just above the course sail and supported by the topmast on a square-rigged sailing ship.
2. 2
   In a fore-and-aft-rigged sailing boat, the sail that is set above the gaff at the top part of the mast.

Proper noun

1. 1
   A neighbourhood of Conception Bay South, Newfoundland and Labrador, Canada.