In typography, describing a font weight that is bolder and heavier than regular bold, often used for emphasis or headings.
From 'extra-' (prefix meaning 'beyond' or 'more than') plus 'bold' (from Old English 'bald' meaning 'confident' or 'prominent'). The typography meaning is modern.
Typography has its own language of boldness: regular, bold, extrabold, and black—each one getting progressively heavier and darker on the page.
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