Try roach
When a sail fills out because of wind blowing in it, the curved, concave part is called its 'belly'.
The mast is the upright mailsail holder. A sprit is a pole that extends diagonally across a fore-and-aft sail from the lower part of the mast to the peak of the sail. Also see bowsprit. All are called sail holders. Tks, Sina.
The lowest fore-and-aft sail on the main mast is called the mainsail, while that on the mizzen is called the mizzen sail. These may be any type of fore-and-aft sail, in any combination. The Scots Zulu, for example, had a dipping lug main with a standing lug mizzen.
If you mean the one that is often fixed to a foreward boom, that would be a Lateen sail.
It is a jib or fore sail that has a slot cut into it.
The definition of a sprit is a long pole that extends diagonally across a fore and aft sail quadrilateral from the lower part of the mast to the peak of the sail.
A lanteen sail
Lateen
yacht this was the original answer but this can refer to a powered vessel too. As in motor yacht. A one masted fore and aft rigged vessel is called a sloop and can have various sail plans e.g. Gaff rigged, bermudian rigged
The most forward sail is normally called a jib.On vessels with more than one jib, the names of the jibs (from forward to aft) are: Flying jib, Outer jib, Inner jib and Fore (topmast) staysail.
Yes it is. It is the edge of a fore-and-aft sail next to the mast or stay.