Asking about definitions of word "sugar" in biochemistry
Absolutely correct!


  N-Linked oligosaccharides are initially synthesized as lipid-linked
  precursors. The lipid component in this process is dolichol, a
  long-chain polyisoprenol of 14 to 24 isoprene units (17–21 units in
  animals and 14–24 units in fungi and plants; isoprene units are C5
  units with the carbon skeleton of isoprene , which is linked to the
  oligosaccharide precursor via a pyrophosphate bridge.


Dolichols apparently anchor the growing oligosaccharide to the endoplasmic reticulum membrane. These compounds have strong hydrophobic interactions with membrane lipids, anchoring the attached sugars to the membrane, where they participate in sugar-transfer reactions.

The pathway of dolichol-PP-oligosaccharide synthesis involves stepwise addition of monosaccharide units to the growing glycolipid by specific glycosyltransferases to form a common “core” structure:



Dolichol pyrophosphate glycoside. The carbohydrate precursors of N-linked glycosides are synthesized as dolichol pyrophosphate glycosides. Dolichols are longchain polyisoprenols (n = 14–24) in which the α-isoprene unit is saturated.

References


Voet and Voet Biochemistry
Lehninger Principles of Biochemistry