noun. a sail (or either of a pair of sails) immediately above the lowermost sail of a mast and supported by a topmast.
noun. the topsail on a foremast.
noun. a topsail set on the mainmast.
1. Verb, base form This annual area guide is mailed out free of charge to those who send an email request to topsail@nccoast.com (see Resources).