Naut. [See JACK sb.1 33 b.] A spar used in fore and aft rigged craft, chiefly yachts, to spread the foot of a large gaff-topsail out beyond the peak. Also attrib.
1882. Standard, 11 Aug., 6/6. Lorna and Chittywee last, the latter with a large jackyardtopsail set.
1896. Daily News, 18 Aug., 3. All carried jackyards above their mainsails.
Hence Jackyarder, a jackyard topsail.
1892. Daily News, 8 Aug., 3/7. They [the yachts] reached out the river under full lower canvas, jackyarders and jib topsails.
1894. Times, 24 July, 10/2. It was astounding that Britannia with jackyarder aloft came scathless out of the squall.
