Short for "Demibold," this weight is heavier than a standard "Regular" but lighter than a "Bold." It provides enough "heft" to stand out on a page without overwhelming the surrounding design.
You can find this font and its relatives through the TUG Store (TeX Users Group) or retail sites like MyFonts . Download Lucida Big Casual T Demi Italic - Facebook font lucida big casual t demi italic