Sans serif
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A [serif] is the little flat line at the top or bottom of a [printed] letter. In a sans serif [font] (which is French for without serif) this little line is missing. See also serif.
Sans serif meaning & definition 1 of Sans serif.
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any typeface in which the letters do not have serifs (= small lines) added to them:
Sans serif meaning & definition 2 of Sans serif.