sugar-loaf noun4 •(historical) A block of refined sugar, usually in the form of a truncated cone, in which form it was traditionally exported from the Caribbean and Brazil from the 17th century to the 19th century. •Ellipsis of sugar-loaf chicory, a certain cultivar. •Ellipsis of sugar-loaf cabbage, a certain cultivar. •(no longer used) A hat shaped like a sugar-loaf.why, do not I know you, grannam? and that sugar-loaf? — 1607 formssugar loaves · sugar-loaves