Lipopolysaccharide

Etymology
Lipopolysaccharide:

lipo: "fat" (from greek λίπος (lipos), meaning "fat"). See also "lipid", "lipase", etc.

poly: "many" (from greek πολύ (poly), meaning "much" or "many").

saccharide: "sugar" (from latin saccharon, meaning "sugar"). This is also the origin of the term "saccharine", meaning "really sweet" if referring to a dessert, or "overly sweet" to the point of being sickly/annoying.

Explanation
Lipopolysaccharides are macromolecules that coat the outer cell wall of gram-negative bacteria, and are comprised of a lipid (lipo) which embeds in the plasma membrane, attached to a chain of many (poly) sugars (saccharide).

Synonyms
LPS